Question: A man leaves his house in the morning and kisses his wife. On his way home from work he sees that somebody has hit a power line. He immediately knows his wife has died.
How did he know this?
Hint: What if this made the power go out?
Answer: His wife was on life support.
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.