I walked into an area, where I saw an enderman spawning. It decided to walk into water causing it to teleport somewhere else, but the weird thing happend after that: The enderman decided to walk from the place it teleported to back to the river it decided to walk into earlier, and the loop started over. Looked like the place was the same every time. This happened until it died.

Unfortunately I wasn't able to record that. Otherwise I would have included a link to a video to prove the occurence.