Construction worker

A construction worker goes to the doctor and says, "Doc, I'm constipated."

The doctor examines him for a minute and then says, "Lean over the table."

The construction worker leans over the table, the doctor whacks him on the ass with a baseball bat, CRACK... and then sends him into the bathroom.

He comes out a few minutes later and says, "Doc, I feel great. What should I do to prevent the constipation?"

The doctor says, "Stop wiping with cement bags."