Oh, got another one. Just Cause 2.
I was bored and messing around in an airfield. In this airfield, a plane spawns in the hanger, taxi's out onto the runway, then accelerates and takes off. And this is the BIG fighter jets I'm talking about. What I like to do is jump on them, place a couple of Triggered Explosives on the wing, jump off and wait. As soon as the plane starts to accelerate for take-off, I trigger the explosives. I make sure never to put enough to destroy it completely, just enough to set it on fire. If timed right, the plane takes off, and explodes in mid-air. Another plane spawns, repeat.
One time, however, I was going back to the hanger to wait for another plane to spawn when the pilot's body crashed down right in front of my eyes! The plane had taken off and gone straight up in the air before blowing up, and the pilot had just kept going for a while before falling back to Earth!