Three guys are crossing the desert.

Three guys are crossing the desert. A black guy, and white guy and a Mexican guy. They are allowed a total of 3 wishes to be granted for their journey across the perilous desert. Wanting it to be completely fair, they decide to make a single wish each.

The white guy goes first. He thinks about the situation for a second and then asks for enough water for the three of them to survive the crossing. His wish is granted.

The black guy is up next. He thinks about it for a second and then asks for enough food for them to survive the crossing. His wish is granted.

Last but not least, the Mexican is up. He thinks about his wish long and hard. After an hour rolls by, the other two grow impatient. But right before they can tell him to hurry up, the Mexican jumps up and throws his hand in the air.
"I've got it! I wish for a car door!"

Supremely confused the white guy asks him why he wished for a car door.

The Mexican replied "So for when it gets hot outside, we can just roll down the window!"

Edit: Minor corrections. Mobile posting is difficult