Karl telling a story about an old man he was talking to wearing pink shorts while on vacation. Ricky questions why Karl was so focused on the man's shorts, and Karl tries to explain that the man's story was boring and he was trying to focus on something else causing Ricky to crack a few jokes about Karl staring at the man's crotch area. It's one of the few times where Karl actually laughs.
Karl's last name (Pilkington) being misspelled as "Dilkington". Ricky's reaction (gasping laughter followed by his usual cackling laughter) to it is priceless.
Not only that but Steve needed two attempts at getting the 'punchline' out.
Stephen's experiences on the beach in Rio, and in the line of a nightclub.
"There were so many beautiful women in Rio, it actually made me angry!"
The first reading from Karl's diary, when he describes a trip to Gran Canaria.
"Everyone sat and watched one of the local cats lick its bollocks."
Karl giving his top 5 predictions of the future in "The Ricky Gervais Guide to... The Future" (also in season 2, episode 8 of the animated series). The predictions are all insane, but Ricky's reactions to them are hilarious themselves. By the time they're halfway through, Ricky is so out of his mind he starts babbling in between fits of laughter.
"I'm gonna die... I'm gonna die... They used to say, an apple a day... keeps the doctor away... THEY USED TO SAAAAAY!! ... They used to say pull your trousers up, now they're saying put them down, you cunt... I've never heard such fucking drivel..."
Immediately followed by Ricky falling off his chair.
Karl's idea for a movie The Love Of Two Brains starring the non-existent Clive Warren.
And though they know who Karl meant to say, Ricky and Steve insist on treating Clive Warren as a real person:
Ricky If I know Clive Warren...
Steve And I think you do!
When talking about a poison dart frog with enough poison in its body to kill a thousand people:
Karl: ...well, who eats frogs?
Stephen: The French!
Ricky: *laughs* and then they go (in terrible French accent) "Sacré bleu! You have killed me and 999 of my friends!"
In the third season, Karl calmly explains that you can throw a baby out of the window and it won't get hurt, followed by Ricky and Steve explaning that you don't throw things out of the window!
Karl describes his hypothetical marriage to a World War 2 soldier in bizarrely specific detail. Ricky's reaction is priceless:
Ricky: *hysterical laughter* That's one of the weirdest fucking scenarios I've ever heard! Why the fuck was the telegram coming before the letter? So specific! "It wasn't like Harry", who the fuck's Harry?! *more hysterical laughter*
The best part was the fact that Karl seemed to have fully developed this soldier husband right down to the fact that he wasn't romantic at all;
Ricky: So.. What, didn't he whisper sweet nothings in your ear?
Karl: Nah, he was just like "get your knickers off!".
On the XFM show, Steve reacts to one of Karl's Monkey News segments by declaring that they should hold him down and rub Ricky's nipples on Karl's lips. Then they proceed to do it while Steve announces the next track, with Karl's protests getting more and more muffled.
Ricky and Karl's hypothetical argument over placing laws on safety helmets, which excalates to Karl the "President Of Society" coldly snarking at Ricky's two hypothetical children who are blaming him for their father dying in an accident, all while trying to sound as cute and heartbroken as possible.
From the XFM show, Ricky and Steve's incredulous reaction ("NOOOOOOO!! WHAT ARE YOU DOING?") to Karl suggesting that Chinese people don't age well, followed in the next show by Karl's music quiz (where several tunes are mashed together) "I know you're just sixteen, but looking all of twenty one... That's because... Chinese... Look...Older"
The car of the future, with in car toilet: "I'm sick of playing I-Spy, I'm 'aving a shit!"
"You thumped a monkey."
The whole CB radio bit and Steve and Ricky's snarking it's 'secret' codes: "Can I just confirm, you're burning fifteen?"
Ricky: Sorry, two seven year olds? "You're out of order!"
Steve: "Cut it out! Show her a bit of bloody respect!"
Ricky: Were you wearing trilbys?
Steve: He put his cigarette out in the sink and said "Leave it!"
Ricky: "Get out of my face!"
Karl: So I just said "Why are you getting involved?"
Ricky: (laughter) Two seven year olds! "Why are you gettin' involved?" oh God!
"Rita... What?... This time l... I KNOOOW! You were packing fucking socks in a rubber-cunting bag!"
Karl tells The Bearded Woman what he thinks; "compared to a fella who got no arms and legs, a bearded woman... Get Out!"
In the XFM show, during one game of Rockbusters, Steve decides to award the prizes to a person whose name amused him. Their name? Gerald Preston. Steve thinks the name sounds like a man from a past generation, while it causes Ricky to laugh at how unfunny the name is.
In the XFM show, Karl has Ricky trying to solve lateral thinking problems. Karl describes a man who every night turns the light on and then goes to bed, and Ricky must find out why he's turning the light on instead of off. After a few unsuccessful guesses, Ricky finally gets it.
Ricky: He's not sleeping on the job as a lighthouse keeper?
Karl: ...Well done.
Ricky: That's not it, Karl.
Karl: He's a lighthouse keeper.
Ricky: Right, why wasn't the light on all the time?