Here's a load of quotes that are only funny if you know the people that said them:
"You can't cook porridge in a wok!" - David
"It has a certain pathos." - Mr. Mann, on the Gopsi garden
"Silly buggers." - Apple King, after being shown the Gopsi garden
"[2 * 64 =] 124"(sic) - Ian (when drunk)
"What's 64 * 128?" - Timothy (when actually drunk)
"It's a doobery without a whatsit!" - Stephen
"With the absence of a woman, I need something to have sex with!" - Timothy, on his hat
"McJob" - Stephen
"I'm just going to put this in Mr Pigeon's Pearson hole..." - David
"A pint of blue with a fish in it, please." - Simon
"Who on Earth would name their child Zack?" - Timothy
"The liabilities could run into millions!" - Philip Wright
"Who's been eating dead rats?" - Pencil
"I haven't got a dog!" - Stephen
"...Percy's weird friends...." - Kit