Desert Travelers

Three men were in a desert. One man was holding a jug, the 2nd was holding a paper bag, and the last was holding a car door. A man came around and asked the 1st why he had a jug. He said it was his water and if he got thirsty, he would take a drink.

Then he asked the second why do you have a paper bag? The guy said this is my packed lunch, so if I get hungry, I will eat my lunch.

Then he asked the last man why he has a car door and he said if he got hot he would roll down the window.