This is probably the biggest overlooked gem of 2005. It is one of the funniest movies I have ever seen. It is quite complicated -- the first time I saw it, I really didn't understand what was happening -- but on a second viewing, the plot will probably make sense.
Kiss Kiss, Bang Bang stars Robert Downey Jr. and Val Kilmer. They have incredible chemistry, and are absolutely hysterical. The film's humour is absolutely crazy, and all over the place -- some of it is light gay humour, some slapstick, some romantic (Downey Jr.'s character isn't very suave, to put it lightly).
I would definitely recommend this movie to ANYONE (as long as you don't mind women's nipples. Or people's fingers being cut off (by a door being slammed on it)). Anyone who enjoys humour, mystery, or any of the actors in this movie will LOVE it, guaranteed.
The only reason Kiss Kiss, Bang Bang was not an enormous success was because of a lack of marketing. But with the DVD release, this can change! You should definitely check out this movie! It is superb!