Astronomer

Astronomers got tired after watching the moon go around the earth for 24 hours...

So they decided to call it a day

How do astronomers organize a party?

They planet.

Why do astronomers put beef in their shampoo?

for meatier showers.

I picked up a hitchhiker last night.

He seemed surprised that I'd pick up a stranger and asked, "Thanks but why would you pick me up? How do you know I'm not a serial killer?"

I told him the chances of two serial killers being in one car would be astronomically low