Possibly the ultimate Thriller film ever. The plot is awesome, the depth to the film simply incredible. When you watch the film the second time you see all the little signs pointing to the actual ending, which you simply did not get the first time, and of course there is:
KAISER SOUZE!!!!
I actually never thought much of this movie. I realised very early who/what Kaiser Souze was so it wasn't that impressed. Reading Agatha Christie pays off ;)