The man is eager to cure his stuttering so he agrees to the operation. The operation is a success, and he stops stuttering. Two months later, the man calls the doctor and tells him that since he's had the 6 inches cut off, all of his girlfriends have dumped him, and his love life has gone down the tubes. He insists that the doctor do another operation to add the six inches back on.
There is silence on the other end of the telephone, so the man repeats, "Hey doc, didn't you hear me? I want my six inches back!" Finally, the doctor responds, "F-f-f-f-f-f-u-c-k y-y-y-y-ou!