Four guys are driving cross-country together. One is from Idaho, one from Iowa, one from Illinois and one from Wisconsin.
A bit down the road, the man from Idaho starts to pull potatoes from his bag and throws them out the window. The man from Iowa turns to him and asks, "What the hell are you doing?"
The man from Idaho says, "Man, we have so many of these damned things in Idaho, they're laying around on the ground - I'm sick of looking at them!"
A few miles further down the road, the man from Iowa begins pulling ears of corn from his bag and throwing them out the window. The man from Wisconsin asks "What are you doing that for?" The man from Iowa replies, "Man, we have so many of these damned things in Iowa, I'm sick of looking at them!"
Inspired by the others, the man from Wisconsin opens the car door and pushes out the man from Illinois.