A Texan and an Oklahoman are fishing when all of a sudden they catch a big, golden fish. Much to their surprise the fish opens it's mouth and starts pleading for his life; "I'm a magic fish, if you release me, I'll grant you each one wish."
The two men look at each other and the Texan turns to the fish and says "I want a wall to keep people from comin' into the great state of Texas, especially Okies." the fish flops around for a second before telling him that his wish has been granted.
Turning to the Oklahoman the fish then asks what his wish will be, "So let me get this straight, my buddy just wished for a wall around Texas and there is no way in and no way out?" he asks "That's right." says the fish.
"Fill it with water." says the Oklahoman.