What has been your worst experience dining out?

Fortunately it was before the meal, but still.
I saw smudged fingerprints on my plate…ink, dirt ? I couldn’t tell. I asked the waitress, who looked unimpressed, picked up the cloth napkin, blew or spit on it, and wiped off the fingerprints.

Then she asked us (me and my brother, who was horrified) what we wanted to order.
"Nothing," I replied, getting up and leaving. My brother followed.