A construction worker goes to the doctor and says, "Doc, I'm constipated." The doctor tells him to drop his pants, examines him for just a moment, and then says, "Lean over the table."

The construction worker leans over the table, the doctor whacks him across his ass with a baseball bat, and then sends him into the bathroom. When he returns, he says, "Doc, I feel great! What should I do?"

The doctor says, "Stop wiping your butt with those old cement bags!"