This is the most surreal joke ever told to me, and the first time I heard it I was laughing so hard I cried...

A man runs into a Pharmacy.

"Quick!" he calls out to the assistant. "I need a red toothbrush!"

Sadly the assistant shakes her head from side to side. "I'm sorry, sir, we only have blue."

"It's okay," replies the man. "I'm on a bike anyway!"