There were these two not so bright guys who had to get across the desert. Since they didn't have enough money for a car they decided to buy a camel.

The camel dealer promised them that the camel would get them across the desert if they made sure he was full of water before they left. They took the camel down to the water hole, but the camel would not drink. So finally the first guy says: "I have an idea, why don't I hold his head down in the water and you suck on his butt. That way the water will be drawn up into him like a straw." The second gut thought about this for a while and finally agreed.

After a while the first guy asks "Well is it working?"

The second guy replied "I think it is going to work, but you have to pick his head up just a little because I'm just getting mud."