Question: Suppose you had to pick 1 of 3 doors to go through. One has ninja assassins, one has a lion that hasn't eaten in 3 months, and one has a flaming inferno. Which door should you choose in order to live?
Answer: The one with the lion. It hasn't eaten in 3 months, therefore it's dead!! ;)
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.