Answer:
Man's most important invention.
What bank has no money?
There is a man in a 4 story building. He jumps out of the window and is unharmed. He used no padding, and had no harm done. How?
When this is found in a road you are forced to make a decision.
What is something that can go up quite easily, but is not as easy to bring back down?
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?