ok here is one joke, that i like to share with my friends in construction:

A contractor's son is approaching his 6th birthday and when his dad asks what he wants as a present, he asks his dad to give him a baby sister or a brother. His dad says "I would but I can not do it in this short amount of time. Your birthday is 5 days away. It is impossible son..." Then the kid says: "why dont you do what you always do at work... just put more men on the job!!!" )