He does it for safety porpoises
I've recovering from a bad road bike crash where I fractured my hip and was in the hospital a few days after surgery (about 4 weeks ago). I was knocked unconscious in the crash, but my helmet probably saved my life and I was diagnosed with post-traumatic amnesia.
A few days later I was talking to a friend and he was asking about the crash and I said, "The doctor told me a name for the type of amnesia it is, but I don't remember it..."
He replied with a laugh, "Did you mean to make that joke?"
I didn't. It's hilarious.