A surgeon says that one night during his residency he was called out of a sound sleep to the emergency room. Unshaven and with tousled hair, he showed up accompanied by an equally unpresentable medical student.

In the ER they encountered the on-call medical resident and his student, both neatly attired in clean white lab coats. The medical resident said to his student, “You can always tell the surgeons by their absolute disregard for appearance.”

Two evenings later, the same young surgical resident was at a banquet when called to the ER for yet another emergency. He was stitching away on his patient this time wearing a tuxedo from the banquet when he encountered that same medical resident with his student. The medical resident looked at the surgical resident now wearing the tuxedo, then …