What are some funny puns?

I'm going to give you some really funny puns i came up with.

I'm reading a book about anti-gravity, and i can't put it down

I know how to juggle, i just don't have the balls to do it.

I want to find my watch, but i just don't have the time to do it.

I forgot how to throw a boomerang, but it eventually came back to me.