Okay, so this isn't a sandwich, but my wife introduced me to something that she said was called "reuben chicken." Boneless chicken breasts, sauerkraut, Russian dressing, and Swiss cheese in a casserole dish, iun that order. Cook uncovered at 350 F for an hour, or until the Swiss cheese starts to turn brown. What a meal. The kraut makes you particularly dangerous the next day, too.
(ETA: It doesn't qualify as a bouncy, as "so" is the
second word in the first sentence.
)