Gosh I hated when we did this promo. Without fail, the gaggle of tweens would come in and order. Usually no big deal, but they’d always want stuff off the “secret” menu. So I end up having sixteen grande “Frankenstein” Frappuccinos lined up on the counter waiting to be made. And usually without fail, at least two of the kids would suddenly realize they had wanted a different milk, or add-in flavor after the fact.
Coming from a customer service background I actually handled this in stride, but I constantly rolled my eyes when it happened lol.