What is the Worst Service You Have Received

If I get really bad service I try to avoid using that company/cafe/restaurant again. There is plenty of choice where I live, so I'll just go somewhere else.

I have an on going disbute with subway. I found a hair knot/ball in my salad. I emailed to notify them and they outright called me a liar

At a restaurant we sat down and the staff just completely blanked us... Did not even ask us what we wanted to order...After 10 minutes of waiting we left the premises...such a joke.