I find it funny when someone names themselves "" or "Justin Bieber" and they don't die n1 so you suspect them easily as Mafia, and most of the times your right. Same with being red in general too.
But what I think is the funniest name I seen someone as so far would be "Hitler from Accounting".
Also I remember a few games ago I said "penis" before the name selecting screen at the beginning of the game (basically where the host is still configuring the option/save). Then I go to my kitchen quickly to get a snack and two minutes later you have a whole game of people named "Blue dick", "smelly cock", "gooey jizz", "red is gay", "im gay", "green dick" and a few other names i can't remember.
Was hilarious.
What about you guys?