A pair of jokers

You are both a couple of standup comedians lately. Some of your material is coo coo, but you get strong points for effort and you find some genuine laughs here and there. Here are a few of the jokes you have come up with on your own.

From Henry:

Q: Why did the human say meow?
A: Because it had a cat in its mouth.

Knock Knock
Who's there?
Bullet train.
Bullet train who?
Ding ding ding ding.

Why is your face so small? (No, we don't really get this one but you LOVE it.) 

Punny laughs from Lucy:

Q: What does a cat call Mjölnir? (Thor's hammer, pronounced me-ull-near)
A: Meowlnir.

Q: What does a mermaid use to wash her hair?
A: Clam poo.

Crazy kids. But do you what's really funny?...Your face!