Yeah, well...that's not quite what I did.
In one case, I was more testing hardware than software: they gave me an XBox360, a game, and told me to play all day; if something broke, tell a supervisor. But we weren't trying to break it; we were just playing to see whether the hardware could take it.
Sometimes it was the same game all day, sometimes everybody rotated games once and hour. Sure, you might get a really un-fun, craptacular game for the all-day test, but even if we did, we had it better than the boot-testers. THEY had to load a game, see it boot, eject, lather, rinse, repeat. All damn day. *shudder*
I also worked on the production end a while back; cut-scene scripter on one game, level designer on another. We had to test our own levels before handing them off to someone else.