Four engineers; a mechanical engineer, a chemical engineer, an electrical engineer, and a computer engineer were traveling in a car when, suddenly, the car stopped.
"Sounds to me as if the pistons have seized. We'll have to strip down the engine before we can get the car working again" said the mechanical engineer.
"Well," said the chemical engineer, "it sounds to me as if the fuel might be contaminated."
"I think it might be a grounding problem," said the electrical engineer, "or maybe a faulty plug wire."