I like dark humour. The cult movie Harold and Maude (1971) is my favourite movie of all time.
Director Hal Ashby has made an optimistic film about an old lady and the recurring suicidal tendencies of a confused young man in this film. It has a unique charm and hits upon a universal nerve. The inevitability of life can be disconcerting but Harold and Maude find little pieces of joy in the most obscure places that make living all the more worthwhile.