I was playing Just Cause yesterday,
and i found 2 main ways how to crash the game.
1. When you place smoke for an extraction or heavy drop as soon as he starts to place the smoke push select and the loading screen will come up but never go off.
2. If you are in the stunt position on a car hold down R1 and carry on driving slowy, now push L3.
The picture freezes but the music continues.