Is it possible for a Mac to be hacked? Not necessareily taken over but perhaps used as a relay for IRC or something? We recently had a situation where a computer sat idle overnight and the next day a small animated icon with text bubbles was seen on the screen (in front of all open apps). When the user moved the mouse, the little animated icon looked up as though it was looking at the user, it's eyes got big, then it scooted off the screen (no I am not using). I've never heard of this before, not on a mac at least? Was someone snooping/hacking? Any thoughts?