Question: A man enters a field. As soon as he does, he dies. He is carrying a mysterious package. What is the package and why/how did he die?
Answer: The package is a broken parachute! It didn't work and he fell to his death on a field.
Question: A semi truck weighing exactly 10,000 pounds gets onto a bridge that is 100 miles long. The bridge's weight limit is exactly 10,000 pounds, any more will break the bridge. After going about 80 miles down the bridge a small bird lands on the truck.
Answer: Nothing, after traveling 80 miles the truck will have surely burnt enough fuel to allow the bird to land on the truck without breaking the bridge.