Originally Posted by Galt

From Saving Private Ryan:

Captain Miller (played by Tom Hanks) choosing to set Steamboat Willie (the German soldier captured at the machine gun bunker) free, rather than executing him on the spot. Willie rejoins the German troops and turns out to be a pretty bad-ass soldier in the battle at the end of the movie. I know he killed Private Mellish, and I think he was also the one who fired the shot that eventually killed Captain Miller.