The Life of David Gale - The ending part when Kate Winslet finds out who killed Laura Linney. 
This is one of my favorite mystery movie.  Kevin Spacey at his best...even better than Usual Suspect's Keyser Soze. 

Sling Blade - Every scene in this movie is memorable.  The scene when Billy Bob kills Dyole and when he recalls why he killed his mother are the best. 

Parinda - The part where Jackie Shroff kills Nana Pateker.
Bollywood has stopped making good movies like this.