Latest / The Copywriting Podcast with Fexingo: Sales Letters, Headlines, and Persuasive Writing / How a Parenthetical Phrase Lifted Response by 31 Percent
Transcript
- Lucas: So let me start with a number: 31 percent. That is the lift in click-through rate a B2B software company got last year from adding exactly one parenthetical phrase to their email campaign. Luna: One phrase? In parentheses? Lucas: Exactly. The original email had a pretty standard call to action — 'Schedule a demo today.' The test version changed it to 'Schedule a demo today.' That's it. The same email, the same list, the same subject line. Just that little qualifier in parentheses near the button. Luna: And it lifted clicks by 31 percent? That seems almost too big. Lucas: I had the same reaction. But this was a B2B audience — procurement managers, IT directors. They get pitched constantly. The original CTA felt like every other vendor. The parenthetical did something interesting: it signaled awareness. It said, 'We know we're asking something of you, and we're not pretending you'll definitely love it.' That small hit of honesty actually made the offer more credible. Luna: So the qualifier made it less salesy, which paradoxically made it more persuasive. Lucas: Right. There's a psychological concept called 'reactance' — when people feel their freedom is being threatened, they push back. A hard CTA triggers that. But 'we think you'll like it' is softer. It acknowledges the prospect's autonomy. You're not demanding action, you're offering a suggestion. Luna: It also lowers the stakes. Like, you're not promising a miracle, just that they'll probably find it useful. Lucas: Exactly. And the parentheses themselves do something visual — they set the phrase apart as a whispered aside. It's like saying, 'Here's the official thing, and here's a more human thought.' That contrast makes the human thought stand out. Luna: I've seen this in nonprofit appeals too. One charity tested 'Give $25 ' versus just 'Give $25'. The parenthetical explained why that amount mattered, and conversion went up 18 percent. Lucas: Great example. That parenthetical is doing explanatory work. It answers the reader's unspoken question: 'Why this amount?' But the B2B example is different — it's not explaining, it's humanizing. It's saying 'We're not a faceless corporation, we're people who think you'll like our thing.' Luna: Is there a case where a parenthetical backfired? Lucas: Absolutely. A nonprofit running an emergency appeal tested adding '' after a urgent request. Donations actually dropped. The parenthetical gave people an easy out. It diminished the urgency. So context matters — if your message already has a lot of urgency or authority, a parenthetical can undercut it. Luna: So the rule might be: use a parenthetical when you want to seem more human or transparent, but not when you need to convey urgency or authority. Lucas: That's a good framework. The parenthetical is a tone modifier. In direct response copy, we often think about word choice, sentence length, headlines. But punctuation is a tone tool too. Parentheses create a different reading rhythm — a pause, a lower voice in your head. That pause can signal intimacy or doubt depending on what's inside. Luna: What about using a parenthetical in a headline? I've seen headlines like 'The Secret to X '. Does that work? Lucas: It can, but it's become a bit of a cliché. That specific formula is overused. But the principle is sound — the parentheses create a mini-twist. They promise a reveal. The problem is when the reader feels manipulated. If the parenthetical doesn't deliver real surprise, it feels gimmicky. Luna: So authenticity is key. The parenthetical has to feel like a genuine aside, not a trick. Lucas: Exactly. In the B2B email, the phrase 'we think you'll like it' is actually honest. They do think that. It's not a manipulation. That's why it worked. If they had written '' it would have failed because it's fake confidence. Luna: You mentioned the visual aspect earlier — parentheses are a pair of curved lines that literally enclose a thought. Does that enclosure affect how we process it? Lucas: There's research in reading psychology that parentheses signal a separate processing stream. The brain treats the parenthetical as a digression, but a deliberate one. It's not just thrown in — it's set apart. That can make the content inside more memorable because it's been typographically highlighted. Luna: So a well-placed parenthetical can actually increase recall of the key point. Lucas: Right. And it can also make the main sentence flow better. Sometimes you have a necessary qualifier that would clutter the main sentence. Putting it in parentheses lets the reader choose whether to read it or skip it. That's a courtesy to the reader's time. Luna: Let's talk about testing. How would someone test this on their own emails? Lucas: Start with a control that has a straightforward CTA. Then add one parenthetical right before or after the CTA button text. The parenthetical should be either a benefit clarification, a risk reducer, or a humanizing qualifier. Run it on at least a thousand recipients per variant. Measure click-through, not just open rate. Luna: And what sample size would you need to feel confident in a result? Lucas: For a 20-30 percent lift, you can get statistical significance with around 500-700 per variant. But the bigger the list, the more reliable. And run it for at least a week to control for day-of-week effects. Luna: Now, if these kinds of copywriting insights are sparking ideas you've actually used, that's the whole reason we keep doing this show ad-free. The way we sustain that is listener support at buy me a coffee dot com slash fexingo. It's a simple way to say 'this was worth my time,' and it keeps the episodes free for everyone. Lucas: Yeah, we don't run ads, so it's really just you all who make this possible. And we're grateful. Luna: Okay, back to the parenthetical. I want to ask about placement within a sentence. Does it matter if it's at the beginning, middle, or end? Lucas: It does. In the B2B example, it was at the end — after the CTA. That's often the strongest spot because it's the last thing the reader sees. It works like a P.S. in a letter. End-position parentheses can modify the entire preceding statement. Beginning parentheses can also work, but they set a tone upfront. Middle parentheses interrupt the flow more, so they're riskier. Luna: What about using multiple parentheses in one email? Two or three asides? Lucas: I'd caution against it. Each parenthetical is a request for the reader to pause and consider a side thought. Too many and the reader feels like they're reading a footnote-filled academic paper. One or two per email is plenty. More than that and you dilute the impact. Luna: So the takeaway is: one well-chosen parenthetical can boost response by 30 percent if it's authentic and placed at the end, but it's not a magic bullet — it can backfire if it undermines urgency or comes off as a trick. Lucas: Exactly. And the best way to know is to test. Start with a simple humanizing phrase like 'we think' or 'we believe' or 'honestly'. See if your audience responds. The data will tell you. Luna: And if you do find a winning parenthetical, you can apply it across other CTAs — landing pages, social ads, even webinar registration buttons. Lucas: Yeah, that's a smart scaling move. Once you know your audience responds to that tone, you can weave it into the whole customer journey. But always test again in each context — what works in email might not work on a landing page. Luna: Alright, a practical challenge for our listeners: pick one email you're sending this week, and add a single parenthetical phrase to the CTA. See what happens. Lucas: And come back and tell us. We'd love to hear your results. That's it for today — go write something that works.