Although I'm not a huge fan of GTA IV, I did buy the game and like always with it, I got bored. So me and a buddy decided to spawn a helicopter, fly to the very top of the city, as high as we could, and jump out to see where we land. If that's not extreme enough for you, I bounced off 4 buildings and landed on the ground....and lived! I may have had only a speck of health left but I still lived. If that was real life...damn I would have wished I'd died.
Other places we've landed:
On top of an old man.
On a boat.
In a tree.
Landed on a car, blowing it up.
There's a bunch more but I can't remember them all.