What is the funniest Joke you have ever Heard?

Not really a joke but in a way it is because it does have a punchline.ready.....This came in an email under WARNING........ ********************************************************* I am just letting you know U'F'O's have landed and the Aliens are taking all of the beautiful, smart people with the..... Don't worry or be frightened,,,, You Are SAFE... I only wrote you to say GOODBYE! **********************************************************I truly did laugh at this!!! hope you did too