One from California, one from Idaho, one from Montana, and one from Nebraska.
As they're driving down the highway, the girl from Idaho pulls some potatoes out of her bag and throws them out window. The other three asked. She said, "I'm sick of seeing potatoes everywhere."
Down the road a ways, the girl from Nebraska pulls some corn out of her bag and throws them out the window. The other three asked why? She said, "I'm sick of seeing corn everywhere."
Down the road a ways more and the Montanan girl grabs the Californian girl and throws her out the window saying: "I'm sick of seeing them everywhere."