My most embarrassing was more of a shock -
My friends and I were over at the railing at the CS restaurant at Mexico to watch Illuminations, and I had some fish and chips to eat (yeah, wrong country, I know).
I was standing right next to a trash can, so I was using it as a table. On the other side of the can was another group of people.
I was eating and watching, watching and eating, and then my hand brushed into another hand in my french fries.
The guy on the other side of garbage can was eating my fries!!!
I looked at him, he looked at me, then he took another french fry and turned back to the show.
I had no idea what to do. It was my fish and chips! I schlepped it over all the way from England! I turned to my friend and pointed at the guy eating my fries, and he sized up the situation, then grabbed the tray from the garbage can and held it in his hands, on the other side of me. The garbage-can guy looked upset about it, but what was he going to do? They weren't his.
Then, of course, my friend started eating my fries. And my remaining fish. So, I couldn't win.