A chemical engineer, a mechanical engineer, and a computer scientist are on a road trip when all of a sudden their car breaks down.

They pull over to the side of the road and start hypothesizing what is wrong.

The chemical engineer says, “It’s probably something wrong with the catalytic converter.”

“No,” says the mechanical engineer, “It’s probably something wrong with the engine.”

The computer scientist says, “Not sure, but let’s get out, get back in, and see if it starts.”