Kind of an old post, but I missed it and so I need to link to it here. It comes from Aaron Bartell and includes the following joke:
boyMicrosoft programmer is smoking and leaving smoke rings into the air.
girlAS/400 programmer gets irritated with the smoke and says to her loverco-worker: “Can’t you see the warning written on the cigarettes packet, smoking is injurious to health!”
The boy replies back: “Darling, I am a Microsoft programmer. We don’t worry about warnings, we only worry about errors.”