The answer to that riddle is a plane in the neck.
Here's more to make you think (from iriddler.com):
A man walks into a bar and asks for a glass of water. The bartender pulls out a shotgun and points it at him. The man says, thank you and leaves. Why?
A man is lying dead with a backpack on, face down in the desert. What happened?
What has 5(sometimes 4) hands but is normal?
The music stopped. The woman dies. Why?
A man decides to quit his job, so he turns off the lights, and walks out of the room, and 200 people die. Why do 200 people die?
Want more? Challenge your brain to some of the hardest riddles and puzzles from Riddles.com.
Check out Tips on How To Solve a Riddle, shared by Howtodothings.com.