When I was a grad student at Purdue my lead prof was always asking me, "How do I tell a Wildcat from a Hellcat", or "Is that an Iowa or a South Dakota?" I told him the easiest ways to tell the planes and ships apart, and I am thinking I could share those here, plus pick up some other tips from you Rogues.
WTF?!!!!! my wife even knows that and she uses paper clips to balance her checkbook. Was that like University of Purdue Online? Killin' me.