As we all know, Endermen don't work in SMP like they do in SSP. Well, that's not entirely the case. I've been experimenting a bit on my server and found that there's a small chance that an Enderman will become aggressive via mousover in multiplayer on rare occasions. I've managed to do it 5 times, all from long distances. They don't seem to mind if you're close by.
It's happened while running the server software straight off of my computer, while on a friends server, and on my 3rd party hosted server. All vanilla 1.8 pre 1, 2, and 1.8.1. I haven't seen anybody else mentioning this happening to them on this forum or elsewhere, so I came here first to get some feedback. What do you guys think? Is it a lag issue or an actual bug in the game?
Unrelated side note: That last Enderman in the video saved his own life by breaking the bottom block of a cactus he was stuck to. That could NOT have been coincidence. (it was)
If you want to agro an Enderman in SMP you need to look a at a point a little bit above their head. Looking straight at them will not work. The few times you have managed to get them angry at you, you probably waved the cursor a little bit up and above the Enderman. Easily done especially if you are far away.