Reminds me of the time a few of us were in Howling Stones. We were moving North and I hit ID by habit, since I was to training that on mobs I was fighting, and it took off running down to zone in and up the east (fake) stairs. What came back wasn't pretty. It made me laugh though. Group was like 'Why did it run off?' and I'm like 'Yea.. that was weird.. I don't know..'Monk says "oops, hit instill doubt by mistake".
Enchanter says "uh-oh.. keep an eye out, it might come back with friends"
So if a mob unexpected runs off and you have a Monk in your group, chances are it was them. Actually sometimes I still fire off ID now and again just to see if it will go off. Normailly I only hotkey that skill if I'm soloing so I don't accidently hit it.