McDonald's at 1605 South Neil Street, Champaign, Illinois.

Look, most McDonald's have some pretty standard service, but I've been to this one several times and it has incredibly inept staff. Every time I've come here, they've gotten my order wrong or nearly wrong, and I have to fix it. They're also extremely slow and make you wait around the POS for a long time, and they tend not to know how to use said POS, and can be rather rude when you're talking with them about the order.