Jagular

A creature that hides in trees and waits for you to stand under it, at which point it proceeds to drop on you. Often times, they will call out "Hallo" and wait for you to look up prior to dropping.

John: "Did you hear what happened to Nancy?"
Carol: "No, I heard she went on a camping trip this week but I haven't seen her since. What happened?
John: "She heard a 'Hallo', looked up, and a Jagular dropped on her."
Carol: "That's too bad, I always likes Nancy!"