I think it's funny. I think you're a stick-in-the-mud if you don't. It's okay to laugh!!
2 Samuel 18:9 tells of Absalom riding a mule, and the mule went under
some oak trees, Absalom got his head (or hair, depending on the
translation) caught in the trees and got stuck. His mule went on without
him. Mule, not donkey (or ass). That's about as close as you'll find.
I hate it when the fun police ruin jokes...
Humor isn't a sin.