I was sitting in my house ( only two blocks high so endermen can't teleport in ) and suddenly an ender mite appears on the floor next to the wall. As if that wasn't strange enough, it appears to be totally bugged out. It looks like it is spinning in circles and otherwise will not move. Attacking it has no effect. Dumping lava on it showed the flames, but otherwise had no effect. Covering it in gravel to suffocate it had no effect.