I coop in the same areas a lot, and have run into most of the repeat invaders at those sls at least a few times. I used to get annoyed watching dumb or inexperienced hosts walk right into their obvious traps, but now it's kinda funny because both the invader and I know the host was enjoying a new "learning experience" and we often wave or bow at each other when the host is dead. It's like those Sam and Ralph cartoons with the wolf and sheep dog being all friendly on the way to work, and then pummeling each other for a while when they're actually on the clock.
https://www.youtube.com/watch?feature=player_detailpage&v=_DLqpt4CIsk#t=37s
https://www.youtube.com/watch?feature=player_detailpage&v=_DLqpt4CIsk#t=37s