I've said this a thousand times already, but all the animals. Speaking with animals is *always* good stuff.
From revolting spiders [read this however you please] to Bisconti the good dog, to the real mistress of the house, the squirrels with Alfira - absolute perfection. Oh and the Owlbear Cub. I *love* the Owlbear Cub. I often complain about the writing in this game, but it really works for the minor interactions. Animals are top notch.
Sending your squadmates up to Dribbles the Clown. Never gets old.
Pretending to be sick at the Doctor's.
Resolving every situation with [Barbarian][Intimidate]
'WET YOUR TROUSER HOLES, BAAASKET IS HERE' - Yes, his name is Basket. If you name him anything else, you're playing this game wrong.
Also: 'Can we fight now, Boo is not used to this taking of turns!'