Like Clockwise, this is just a movie I've always found very funny. Superbly casting some superlative film talents into the board game roles of Colonel Mustard et al, this throws the greatest over-actor of them all in as the butler and lets rip. The murders start to pile up, getting sillier and sillier (three cheers for the Singing Telegram Girl!) The pace picks up, so that about half an hour before the end the butler starts to exposit and virtually never stops. Oh, and there are three endings, just for good measure. And the last line is an all-time classic.