Funniest .... Arsenic and Old Lace is the one that comes to mind .... the physical expressions and gestures of a young Cary Grant .... quite literally made me fall out of my chair laughing.

Saddest ... Can't think of one off the top of my head, but then I usually go for action/adventure, mystery/suspense or romantic comedy when it comes to what I watch.

scarriest ... (since I don't watch FRIGHT movies) I'd say that the scarriest movie is Wait Until Dark ... lots of good suspense and such in that one.