Enderman cannot walk over rails when aggravated.

When in the end, enderman will get stuck on rails when aggravated. Sometimes they will glitch throught though.

1. Go to the end
2. Build a ring of rails
3. Put an endermite in the middle
4. Run around to spawn some endermen
5. Watch them get stuck on the rails.

This was recorded on a server but it doesn't matter, it happens in singleplayer too.
https://youtu.be/t91hQDFqsYo