A stethoscope. A reflex hammer. An otoscope. But then again, I'm a med student.
Non-medicine-related, I'd have to say one of those stress-reliever squishy things, shaped like a cow, with spots and udders and everything. Oh, and once I had two shot glasses in it. Didn't feel like carrying a stupidly small bag around all day.
Wait - the best one was a squirrel call. I kid you not. Kinda like a bird call, but for squirrels. Appropriate, huh?
