So I was walking around while using the Improved Spider Jockeys mod when, lo and behold, I spotted this:
(If you can't see it, it's an Enderman riding a spider)
So I decided to look at him for the hilarity of it, and he can't do crap about it. The game won't let him teleport, even though the sounds and effects still play.
I just wanted to show you guys this, mostly Richard Thought it was amusing.