Some years ago, at Military Flight School, military ATC loved this procedure, right after landing clearance, with the plane on short final, and would apply it to a rookie student pilot everytime they could:
ATC - Student1, please confirm gear down and locked.
To what a student, flying a good old chipmunk ( so no retracting gear there ), would generaly reply with a looong silence, the a/c leaving the glidepath and leveling right away, resulting in many cases in a go-around, a lot of instructor yellin' and even some helmet hits by a very angry instructor's hand, apart from some very hard "behind"/parachute-area kickin' across the hangar after landing. All in a day's work.
One day, the ATC, soon after giving another chipmunk it's landing clearance, made the same request:
ATC - XXXX, please confirm gear down and locked.
XXXX - Gear down and locked by de Havilland.
The reply was made by one instructor in a hurry to get back to the airfield
