Who said all bugs were easy to catch?
Raymond describes a situation where a bug was found (on someone else's software) that had to be fixed by the WinXP team. My question would be: who reported it and did they discover it on the business time-clock?
"I'm sorry - but I have to play Doom for the next 8 hours in order to see if dev really did fix this bug or not."
Sometimes the bug isn't apparent until late in the game