What’s the most publicly embarrassing thing that has ever happened to you?

When I were in college during Speech class, our professor put us into groups to discuss a presentation. My group for some reason was super quite and I was the only talkative one. I brushed it off and we presented, everything was fine until I went back to my car, and saw a giant piece of spinach on my front tooth. It was so ugly, so hideous. Every time I remember what I did with that thing stuck on my teeth, I cringe hard.