in what restaurant did you receive the worst customer service ??

A Dunkin Donuts one Sunday morning about 30 years ago. We wanted to go to Denny’s or Golden Corral but not one single parking space at those restaurants so stopped at Dunkin Donuts. Went to the counter, sat on stools. The lady was waiting on everyone but us, it seemed like we were invisible. He spoke up & asked for coffee, she acted like she didn’t hear. She waited on other customers who came in after us. We sat there another 10 minutes or so waiting. Finally we got up to leave & he says to the woman “Thank you for the coffee” and she says “Your Welcome”. Have never been back to a Dunkin Donuts.