Although this may be a very distant possibility on the 737, it can happen. IMHO the more problems you tackle the better you get go know the aircraft you fly. With my company we use the spare sim time after LOFT to do all sorts of silly things. Manual reversion, gear down, flaps 15, one engine inop, max crosswind, and the runway behind me in a tight valley, is on the top of the list of amusing sim rides. This is not, and may not be a part of the test, BUT it certainly is fun and feels good after a successful landing.
Remember; What has never happened can always happen again!