When possessing a Paramite or Scrab, if you unpossess or quick-save/load at just the right time (I forgot which one it is now) said Paramite or Scrab will remain the flourescent green tinge that they flash when the possession takes hold. You can use this for the plain humour of it, or if you want to see which Scrab wins the fight as you can now differentiate between the two.
Another one was on one of the first screens of the Brewery in Exoddus, if you possessed the Glukkon and got into a position where you could move to and from the screen with the sleeping crawling Slig, you could create the infinite Slig glitch. Basically, you need to shout "HELP!" to get the Slig to go get his pants, then once he's got them, leave and return, and the crawling Slig will be back. Repeat process until you've got well over 30 Sligs. From there it begins to get laggy, and I had some fun making them all shoot each other in the same spot at the same time.
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