Three people were riding in a car:  a hardware technician, a system
analyst, and a software engineer.  The system analyst was driving and, 
when they came to a steep hill she found that the brakes had failed 
and the car started accelerating out of control.

The system analyst pumped the emergency brake, downshifted the gears,
and rubbed the wheel rims against the curb.  She finally wrestled the
car to a stop.  The three climbed out and assessed the situation.

The hardware technician said, "Let's try and  fix it.  I'll crawl
under the car and take a look."

The system analyst said, "No, I think we should get someone qualified
to fix it, a specialist in brakes."

The software engineer said, "Why don't we just get back in and see if 
it happens again?"