In Scrabania, when you possess the Slig (in the fourth area, with the BOOM! lever), as soon as you get him going down on the lift, try shooting.
TADAAA! The lift will keep going down and the possessed Slig will shoot, successfully terminating the other sleeping Slig.
Not a wonderous one, but still wanted to contribute it.
And check out LoStraniero91's Big Glitch Vid (
http://www.youtube.com/watch?v=GNSMVs74j1E). It's got a ton of glitches, and I've seen a fair few of them while playing myself.