I'm not in any P&P right now because the only guy who I'm interested doing a campaign with is too busy to. D;
But, back in the day...
I played D&D. I only have a few stories.
I always play the same character because I am a noob to D&D and the numbers (being as I'm horrible at math and memorizing things) intimidated me. So just having the same character every time sort of helped.
Half-elf, female, Cleric the Cleric. I shit you not. Her name was Cleric.
So the very first ever game I played was the ending of my friend's other joke campaign which consisted of a mad scientist going, well, mad, and drinking all of his various liquids, but not before forcing one of the people in our party to ingest some first. The mad scientist promptly disappeared in a wealth of explosions, and two days later a growth appeared ont he party member who had also drank the liquid, which later turned into a tumor that spontaneously seperated itself from the party member and turned into the clone of the mad scientist.
Luckily, we had more serious campaigns after that.
One time, with a DM named D(I know...) I had been playing my character for a couple of weeks, but I guess something ticked him off that day or I failed another saving role or osmething, and he goes, "You have to change your character name."
I say, "I don't want to... And I don't have to."
Someone interjects, "Uh, because the DM is GOD.."
And I say jokingly, "I don't believe in god."
Someone else goes, "How can you not believe in him?! He's sitting RIGHT NEXT TO YOU."
Stupid, yes, but I still find it funny.
I never did have to rename my character. xP
Then there were just people failing random checks and the DM came up with funny consequences.
A thief did a stealth check and totally flunked it, so when he was sneaking up to some orc he had one finger in front of his face saying "I'm invisible... You can't see me..." While going "Clank, clank, clank" because of his chainmail. Maybe not funny in text, but completely funny when it happened.
Another was a ranger's listening check. There were some gremlins behind a door and he had +2 listen or something, but he completely failed his roll. So instead of hearing what the gremlins had to say, "You hear some fly... In Canada... Fart."
Which is simply ironic, because how can he hear a fly in canda when he can't hear what's in front of him?
.... So let's just skip the part where you go "SQ, those aren't funny" and go straight to the part where you go "SQ, you're way more of a loser now than I thought you were before."
Pssst. It's not really trademarked.