A joke

A blonde, brunette and redhead are in a desert.

The brunette says, "I brought some water so we don't get dehydrated."

The redhead says, "I brought some suntan lotion so we don't get sunburned."

Then the blonde says I brought a car door." The other girls said, "Why did you bring that?" Then the blonde says, "So I can roll down the window if it gets hot."