"Grandpa, rev the engine! I think it heats up the jacuzzi."
The Little Engine That Couldn't.
If he didn't smile there's really not much more they could do, except maybe try it with a dude.
Red lights shouldn't apply to the Batmobile, or any car with a turbo jet engine for that matter.
Dude, you might wanna put that down. Or at least not sleep on it.
So you're wondering what's wrong with your engine? Perhaps a snake got in there.