In case you're wondering.  Yes, you can be banned by Mcdonald's.  Here's how.

On St. Patrick's Day in Richmond Heights, Ohio an angry customer was trying to get her money back for a milkshake when things got real.  According to Cleveland.com,

the Richmond Heights woman, 28, had requested a refund for her milkshake because it tasted old. He told her they could only replace it with a new one. He said she then threatened to throw the milkshake at him, and he told her she was banned from the restaurant.

Then the angry customer tried to knock the phone out of the manager's hand threw her milkshake at the back of his head.  The nuggets on this girl?!?

The manager called in her license plate to the police and banned her from the McDonald's.

Ohio...STOP IT!