Three engineers were going out for a business lunch. They got in the car and set off. A few miles down the road, it spluttered and ground to a halt.

The Mechanical Engineer said, “Perhaps the fuel line’s blocked”.

The Electrical Engineer said, “Maybe the battery lead’s come off”.

The Software Engineer said, “I haven’t got a clue what’s wrong with it, but if we all get out, and get back in again, then it might work”.