What does this joke from the movie Sling Blade mean?

There were these two fellars standin' on a bridge, a-goin' to the bathroom. One fellar said, "The water's cold" and the other fellar said, "The water's deep". I believe one fella come from Arkansas. Get it? What does this mean? I've been trying to figure it out but I... show more There were these two fellars standin' on a bridge, a-goin' to the bathroom. One fellar said, "The water's cold" and the other fellar said, "The water's deep". I believe one fella come from Arkansas. Get it?


What does this mean? I've been trying to figure it out but I still don't understand it. Can you explain it to me? Thanks.
Update: i was really kinda wondering about the Arkansas part.. i dont get how that can relate to their size. . .
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