Ever, or on NWN2? I'm just going to assume you meant ever, because I'm not going to reveal stuff about NWN2 yet, obviously. :ph34r:
You see all kinds of great stuff while in QA though. I've always wanted games I've worked for to have bloopers reels with the hilarious bugs that always pop-up in the course of development. Every game I've worked on has had at least one hilarious bug. A couple of the great ones I've seen:
Jedi Academy - There are stationary gun placements throughout some of the levels of JA. At one point, one of the testers was being fired at from one of these guns by a Stormtrooper - the only thing was, the gun was firing Stormtroopers!
X-Men Legends - For a couple of builds, the Sentinels in the game were engaging in the normal animation for firing their missles - that is, arms outstretched, in a semi-crouched position. The only problem was, the missles were firing from it's crotch. This was fixed pretty quickly, heh.
And more. Both of these were fixed in the final versions, by the way. Bugs are inevitable throughout the course of development, and typically at least some of those are funny or particularly interesting. The most interesting bugs as a QA Tester are usually the ones that require the most thought and effort to track down - however, these aren't always the most interesting to talk about, because they tend to be pretty mundane stuff. What distinguishes a great tester from a good one, though, is that the great ones can narrow down an issue from "the game crashes sometimes" to "the game crashes when I equip Mr. Marvin's Magical Cap and run through the Gate to the Magical Fairy Kingdom backwards." Or something like that.