haputanlas:
Something similar to this:[...]
Maybe a spring instead of an airbag (for safety), but this would definitely be funny to see.
He asked for prank ideas, not ways to maim or cripple your friends for a cheap laugh. There is a difference.
The moment I saw they were using an airbag system I went immediately to "prolapsed colon" and "emergency room" and I wasn't too far off from the look of things.