One of my favorite parts of the Deus Ex story is about Jock. Jock is your helicopter pilot and extracts you from most of the levels in-game. In Paris, there is a suspicious mechanic that is working on Jock's helicopter. You can talk to him to expose him as a fraud. If you knock him out or kill him, JC will tell Jock to search his helicopter and as a result, Jock will find and disarm the bomb. If you don't do that, his helicopter will explode later in the game.