It’s physically impossible to lick your elbow. The reason being that from any angle that you take your tongue is instantly too short to reach the tip of your elbow. There has been known claims of people possessing the talents to do this task. Unless you have an unusual sized tongue or you are incredibly flexible, you won’t be able to perform this act. If you've been blessed with a particularly short upper arm, though, combined with an abnormally long tongue, learning the right reaching technique can help you make this supposedly impossible task a reality.

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