I salute the employees of this location for putting up with rowdy UNCC undergrads (I should know, I was one).
Unforgivable: Leaving the PATTY off the hamburger. Imagine eagerly unwrapping your burger at home, only to find a bun, lettuce, tomato, and ketchup. Tragic. Forgetting a condiment or a special request, okay, but the patty? THE PATTY?! It's been 7 years since this happened and I'm still not over it.