A traveling salesman hit a rabbit while driving.
He stopped and pulled over, along with some other people.
The traveling salesman went to his trunk, pulled out a bottle, walked to the rabbit, and poured the bottle on the rabbit.
The rabbit popped up, hopped about 10 feet, turned around and waved. It hopped another 10 feet, turned around and waved. It kept doing this until they couldn’t see it anymore.
The other people said, “That was amazing. We’ve never seen anything like it. What did you give the rabbit?”
The salesman answered, “Just some hair restorer with a permanent wave.”
Explanation: This joke is a pun on “hair restorer” (a product to regrow hair) and “hare” (a type of rabbit). The “permanent wave” refers both to a hair treatment and the rabbit waving repeatedly as it hops away.