What is your favorite scene in "Arsenic and Old Lace"?

This is one of my all time favorite movies. One of the others is "Father Goose" also with Cary Grant. There are so many great scenes including the one you mention about insanity. I love when the one aunt says "But I wouldn't stoop to telling a fib". That to me always seemed hillarious considering you just found out she'd killed 12 men. It's great and one I always love watching. The whole ending bit with trying to get Teddy into the home and then the Aunts. Oh I might have to put this in to watch:)

Too many to count- I love this movie! The scene where both Cary Grant and his wicked bother run and sit down on the window seat because they don't want the other to find out about the body in the seat, and the look on Cary Grant's face when he realises that the guy murdered by his aunts has been removed from the seat and that it's his BROTHER who has something to hide LOL!! Or how about when his bride comes in to remind him that they're supposed to leave for Niagara Falls? 'But Darling, Niagara Falls!' she say. 'It does?' he asks.