These four engineers are in a car that won't start...

"I think we need to replace the timing belt," the mechanical engineer says.

"No," replies the electrical engineer, "the problem is the ignition coil, 
we need to replace it."

"You are both wrong," says the chemical engineer, "the problem is the 
fuel.  We should drain out all the gas and fill the tank with a higher 
octane blend."

The ME, EE, and Chemical E, all look at the computer engineer...

"Well," the computer engineer says reluctantly, "based on my past 
experience we all need to get out, wait 30 seconds, get back in, and the 
car will start just fine."