- Acceptable Targets: When Ronnie Corbett appeared on the show, there were plenty of cracks about his short stature. Several of them made by Corbett himself.
- Accidental Innuendo: Happens now and then, for example season 1 episode 4:Myleen Klass: Every woman, as you know, goes up and down in their underwear, and so—Leslie Ash: Sorry?!
- Award Snub: Although people were pleased that the show was finally recognised at the 2019 BAFTAs when Lee won the award for Entertainment Performance (especially since the show had lost out on the Comedy Entertainment Programme award five times, including earlier that same evening), there was some upset that Lee and David were nominated separately (with Rob being overlooked altogether) when Ant and Dec were nominated together.
- Cultural Stereotypes: High- and low-class jokes directed at David Mitchell and Lee Mack, respectively.
- Ensemble Dark Horse: Stand-up comedians are generally the guests with repeat appearances, but other guests have been good enough to get a return appearance, among them Gabby Logan and Stephen Mangan.
- It seems to be generally agreed that Nick Hewer stole the show on his series 5 appearance.
- Bob Mortimer has been so popular for his utterly ridiculous stories that often turn out to be true (including burning his house down and performing his own dentistry) that he's appeared at least once a Season since Season 6 (his debut).
- Hilarious in Hindsight: In one episode of Series 1, Angus Deayton read out a joke referring to Carol Vorderman as "mutton dressed as lamb". When the panel and audience reacted, he said "She's not here, she'll never be invited on, so it doesn't matter". She did eventually appear as a guest...in the first episode shown after Deayton had left.
David Mitchell: If there's a nuclear war, I don't want to live...I have no skills. Okay, society is destroyed by a nuclear war, we're basically - we're back to the bronze age...how long is it gonna be before people start pitching panel shows again? It's gonna be at least 2000 years!Frankie Boyle: I'd love to see you in like a Mad Max type of society, as everyone's holding off a biker gang, and you're going "I can think of an amusing reason why one of these four might be the odd one out".
- Angus Deayton closed out one episode with the remark "I leave you with news that according to scientists, you should never trust somebody who speaks in a dull, flat monotone, which begs the question - just what is Ken Livingstone trying to hide?" Made much funnier when Livingstone was actually a guest on the show the following series.
- During Sanjeev Bhaskar's story about crashing into Michael Winner's car and telling him to "Calm down", David immediately questions if this was before Winner's advertisements for esure, and his catchphrase, "Calm down, dear, it's just a commercial." It was, and it's true.
- In response to Kelvin MacKenzie's claim that the "This Is My" guest had built him a nuclear bunker:
- After this, the third series of That Mitchell and Webb Look had "The Quiz Broadcast", a series of sketches in which David's character hosted a post-apocalyptic Game Show in a world that had been destroyed by the Event.
- Similarly, Rob Brydon imagining David and Keeley Hawes going on a date after series 4 episode 1 of That Mitchell and Webb Look.
- Rob Brydon introduced Rhod Gilbert as the man who provided voiceovers for Wales tourism adverts, then suggested that they should have got someone "a little more famous, perhaps with his own hit panel show" to do it instead. A few weeks after the episode went out, the BBC announced they'd commissioned a BBC1 panel show with Gilbert as host.
- The show was censored for making a joke that they felt was inappropriate about Jimmy Savile who, at the time, was a national treasure. With the Savile paedophilia sex scandal of Sept 2012, it appears that making rude jokes about him is completely fair game.
- In Rob Brydon's season two guest appearance, at one point he did an impression of David Mitchell. Mitchell's response was "I know it's hard to get impressions on the telly these days, but this isn't the place." Next season, Rob Brydon became the host of the show. He quickly made it the place to get his impressions on the telly.
- Ho Yay: Quite a bit, especially since Brydon took over as host.Rob Brydon: I met a girl in cyberspace, glitterbabe22, and we started chatting, and eventually ended up having cybersex. ... Turns out we had a lot in common in real life. I was the host of Would I Lie to You? — "she" was a team captain on Would I Lie to You? (looks directly at David Mitchell)
David: To be honest, Lee, I don't know why you come into so many encounters with me expecting arousal.
- Heck, in his first appearance as a guest he spent half the time flirting with Robert Webb and David Mitchell.
- Upon being confronted with a story about Blue Peter presenters Simon Groom and Peter Duncan having a fight in the Blue Peter garden over a parking space because they "didn't get on", David Mitchell suggests that perhaps there was another force at work:David Mitchell: Maybe they actually really did get on. Deep down, there was a lot of love there, but a lot of love and complicated feelings and tears and hate, and they start fighting just to touch! To touch another human! And then the fighting starts getting a bit amorous, and then they're kissing and fighting and scratching their clothes off each other, and then they fall in the pond and it's fine and there's no sex.
- The episode featuring John Barrowman naturally had its fair share of this.
- Received an inevitable lampshading when David's "Possession" claim in series 4 episode 8 was a travel-size dressing gown:
Lee [to David]: You're just like my wife! In many ways!
- And again in series 5:
[Lee is claiming that the initials of his ex-girlfriends spell BERMUDA]Lee: D... Dave. Experimental year. [Points at David] And if you've forgotten it, I'll never forgive you!
- As of series 6, it's not even subtext any more.
[In Season 8, when Lee Mack demonstrates his darts-themed tea preparation]
- And David's gradually grown more willing to join in:
Lee: It's a bit disgusting, but the real truth is, if you've got sweaty palms, it's easier to get them a bit more [easier to throw].
David: I've got sweaty palms.
Lee: Yeah, but I don't want you, because then I've got to drink the tea.
David: Oh, right.
Lee: And you're not always gonna be there for me, are you?
David: I am.
Lee: Please say you're not, David.
- Magnificent Bastard: Ensemble Dark Horse Nick Hewer was very effective in his appearance, eviscerating the other pannelists and lying very effectively.
- Kevin Bridges spun one of the most masterful deceptions on the show.
- Memetic Mutation: The Hoot Owl of Death seems to be heading this way.
- Outgrow The Trope: The panellists are much less likely to dismiss a story based purely on the facts as they were in series 1. Indeed, by series 7 there's at least one case of a team voting a story true purely because of how inconsistent and implausible it is.
- As early as series 2 there's an example of a panelist deliberately telling a lie very badly for the Rule of Funny rather than actually try and defend it.
- Periphery Demographic: The show has become very popular with younger children and families since moving pre-watershed.
- The Scrappy: Janet Street-Porter, as she didn't seem to understand the concept of the show and became very aggressive whenever she was being questioned, to the point that when David Mitchell pointed out a problem with her story in the "This Is My" round she walked over to his desk and shouted at him until he said there wasn't any problem with it.
- Watching the other panellists react to her bizarre behaviour is pretty hilarious, though.
- Terry Christian, who acted unbearably smug throughout his entire appearance despite being completely out of his comedy depth. Didn't help that he purposefully mislead the opposing team during the "This Is My" round.
- Spoiled by the Format: This would only be apparent to anyone who had been in the audience, but for many series, two of the stories in the first round would always be true, and the other two would always be lies. One or two later series have changed this. Similarily, if David and Lee both had stories in the Quick-Fire Lies round, one would always be true and one would always be a lie (or, if only one of them had a story, it would be a lie).
- The "This Is My" guest will almost never belong to the team captain; four of them have belonged to David and seven to Lee, out of over 90 episodes. The show tends to actively parody this by giving the captains the most ridiculous stories imaginable for this round, to the point that on the very rare occasions that when they are actually telling the truth it'll be notable because of how unusually reasonable the claim sounds. (Although this was eventually subverted in a Series 12 episode, where David had a claim about the guest recruiting him for an "underground ping-pong club" which sounded so like one of his usual ludicrous made-up stories that the opposing team barely even bothered to take it seriously... only for it to turn out to be true.)
- Unexpected Character: The show can, unlike other panel shows, book just about anyone the producers like, and sometimes they manage to get some very unexpected people on. These can range from big names like Keeley Hawes, Ray Winstone and Tom Courtenay, to people you'd never expect to show up because they rarely or never appear "as themselves" (such as actors Craig Parkinson or Mark Bonnar), to names you simply wouldn't associate with light entertainment (such as The Apprentice aide Nick Hewer, or journalist and member of the House of Lords Joan Bakewell).
- What Do You Mean, It Wasn't Made on Drugs?: The set design for series 3 onwards.
- WTH Booking Agency: There were some... questionable choices of guests (Kelvin MacKenzie and Janet Street-Porter amongst them) in the third series.
- The appointment of Paul Henry as host of the New Zealand version of the show.
- WTH, Costuming Department?:
- Lee is generally dressed more casually than David or Rob (who are invariably wearing suits), which occasionally leads to some bizarre clothing (in series 5 he appears to be wearing pyjamas and a biker jacket in different episodes).
- In his appearance, Rhys Thomas seems to be dressed as the Fifth Doctor for some reason.note
- The Woobie: Miranda Hart in Series 5, episode 1.
YMMV / Would I Lie to You?