A player can defend against mobs by placing cobwebs against a ledge. The cobweb prevents jumping so mobs won't go up the ledge. Spiders are an obvious exception to this defence but endermen are surprisingly also unimpeded

Steps to reproduce:

1. Dig a 1 block hole and place a cobweb inside it
2. Use an enderman spawn egg on the cobweb to seemingly trap the enderman
3. Wait for the enderman to walk out or lure it out with an endermite

The same kind of happens for sweet berries however the enderman will not find a path on its own. It can however still be pushed out of the hole.