Cancer is no laughing matter. But one young patient's father is on a mission to make him feel better, one joke at a time.
Miles Austrevich has battled brain cancer three times. And now it's come back.
Miles will need to undergo two more stem cell transplants at Los Angeles Children's Hopsital and stay in isolation for three months.
His father, Len, used to own a comedy club and started collecting videos of jokes for his son to cheer him up.
The goal is 5,000 jokes. Hundreds have already been sent in, including one from Parks and Rec Star Amy Poehler and Tonight Show host Jay Leno.
Miles told Leno, "I really like going on the website checking out the jokes. And a few times, when I've been having a lot of trouble or had a bad day. I go in there and it completely cheers me up."
If you'd like to send a joke of your own, it's easy to do. Just go on jokes4miles.com and follow the instructions.