LIke this curious habit taught at flying schools that you should call wheels down and locked and three greens in fixed gear aircraft!
Down and welded!
I was taught BUMCFSH or its slight variations, 'Undercarriage - Fixed'. The reasoning I was given was to get in the habit of thinking about undercarriage.
However, on the other side of the coin - once your training reaches the point of flying retractable undercarriage aircraft, are you doing it parrot fashion and not reallly checking before moving on the the next item?