It's only funny if no one, and nothing is hurt.
Then, in hindsight it can be hilarious.
At the very least a fuel shutoff would be appropriate. He was not suffering from a run away engine due to oil in the fuel (no smoke).
Heck, a rope in the prop would have stopped him, again, hindsight and armchair quarterbacking...
Going below and shoving a rag in the air intake or tripping the compression lever after first ripping off the engine cover and getting to the normally encased engine takes more fortitude than most people can muster while the boat is going full speed backwards in a crowded harbor.
Boats with no emergency shut off in the cockpit are just poorly designed, I can say that because I can get to my diesel in exactly 2 seconds from my helm station.