some riddles?

How about these, no Googling

1)
The person who made it doesn't want it.
The person who bought it doesn't need it.
The person who uses it doesn't know they're using it.
What is it?

2)
The more you take away from it, the bigger it gets.
What is it?

3)
It's nighttime and a man is going home. A man in a mask blocks the path in front of him, so he turns around and runs back the other way.
Why did he do this?

4)
What runs and has no feet?
Has a mouth but doesn't speak?
Has a bed but doesn't sleep?

Note: These are all pretty common riddles from off the top of my head, so don't spoil them if you've heard them before.