The biggest mistake I made was actually staying and working for them for 2 years. The very first day I heard yelling and cussing from one shift manager to another shift manager. The very same day I heard shift managers yelling and cussing at a customer and the customer sort of throw their coffee at them. You won't always please everyone that comes in the store. I've been called every name in the insult book and here in Austin Texas customers can come up some interesting insults so that's always a plus or a laugh for later