Nope. You all guessed nails, staples etc. So he'd only buy 4 nails, or 4 staples?
A man is doing some work on his house and went to the hardware store. He tells the clerk what he wants, and he's told that they're $1 each. Fine, I'd like 5000 please. He's only charged $4. What did he buy?
-----House numbers! His house number is 5000
Today's question is
It has been estimated that 50% of the world’s population knows how to do this. What is it?