Knock down jokes

What do you call a bowling ball that falls from the sky and knocks down all the bowling pins?

An airstrike.

9/11 was a round of Clash of Clans. They knocked down two towers, not three.

Why didn't the chicken cross the road?

'Cause it got knocked down on its way.

What is the difference between a coconut and your ex?

One is fun to knock down by throwing rocks at, the other one is a coconut.

What did the man say when he knocked down the bookshelf?

Looks like I've only got myself to blame...

I get knocked down, but I get up again, as long as I have 46 chromosomes.