My third lesson, R22. Instructor says "I've already done the pre-flight, but you do the 3-2-1 before we go." So I check oil levels in engine, MRGB, TRGB, then both the belts and the TR itself. Get back to the cockpit. Instructor: "Very good. X got his licence last Tuesday and still can't remember that."
It's not as if they don't know about it...