Definitely THIS^^^ LMAO it always cracks me up. But its the original so you HAVE to love it.
Mine is "Barry! Where one earth have you bean?" (not been. Pronounced Bean, like bean stalk) lol

Hey John
My favourite lines are right from the begining when they first enter the mansion. Off the top of my head it went something like this:
Jill: What is this?
Barry: What is this?
Jill: Its a mansion!
I cant rememeber the exact words but it was something like the above. It seemed to be delivered so dead pan and without feeling that it always makes me smile.
Def.