What the worst customer experience you've ever had?

Fitnessman168

For anyone who worked in fast food retail walmart etc what the worst customer experience you've ever had or seen?

Here is mine-> I used to cashier at a department store. It seemed that whenever a customer was in a bad mood, s/he felt entitled to dump on the poor guy at the checkout. So...our store decided to add some reserved parking spaces for pregnant women. Shortly thereafter, a crabby male customer was checking out at my register and snarled, "First you have handicapped parking and now you add parking for pregnant women??!! What's next???"
I responded, "Parking for *kitten*. You can be the first one."
I was so happy to leave that job.