Unreal Tournament 2003 had a rather *ahem* strange unused resource. In the static meshes for DM-Junkyard, or at least that's where I heard it came from, there is a shiny, gold, well... here's a screenshot.

Kind of NSFW...

You would never see it in the game, but considering that the game shipped with UnrealEd and Epic encourages modding, it was only a matter of time. This shot is actually from a mutator that reuses the mesh. It's called Goldmember II and it gets bigger as you accumulate more kills. I remember messing with the maximum size parameter and making it big enough to fill a map. Yeah, those were some fun times.