Usual Dumb Blonde Joke.

A man was walking along a back lane when he heard a bit of commotion and work going on. He stopped and looked over a fence and saw a group of blondes working away. He asked one of them what they were doing. She replied,"We are building a space ship", He asked where are you going? She replied ,"To the sun". He told her they would get burnt up before they reached it. She replies, "Don't be daft ,We are going at night"!