Jordan's brother and Dr. Cox's best friend Ben comes into the hospital after piercing his hand with a nail-gun. When his hand won't stop bleeding, Dr. Cox and J.D. are concerned that he may have an underlying, serious condition. J.D. is in denial when he receives Ben's test results. A series of paperwork mistakes nearly has Turk operate on the wrong patient, and has Elliot incorrectly inform her patient, Jill, that she's pregnant.