A general practitioner, an internist, and a surgeon go duck hunting. A duck flies overhead, and the GP says, "Gee, kinda looks like a duck," and shoots it. Another duck flies overhead, and the internist sights it. "Rule out pheasant, rule out goose, must be duck" he says, and shoots it. A third bird flies overhead. The surgeon raises his gun. BLAM! BLAM! BLAM! Then he looks at the others. "What was that?" he asks.