One common one is when the elastic on the underwear breaks during the school day. This can make it uncomfortable and also cause some embarrassing adjusting. For example, a girl was sitting in class and suddenly felt her underwear slipping because of a broken elastic. She had to be very discreet about fixing it.
I had a huge crush on a boy in school. One day, I was writing a love letter to him during break time. But I didn't notice he was standing right behind me. He saw the whole thing and I just wanted to disappear.
One embarrassing story is when I tripped and fell flat on my face in the middle of the school hallway while everyone was rushing to class. My books went flying everywhere and I could feel all eyes on me. It was so mortifying.
In my high school English class, a boy in the back row farted during a very quiet reading time. It was like a trumpet blast. The whole class burst into laughter, and the teacher had to wait for a while to regain control.
One example is Taylor Swift. There were rumors that she was bullied in high school. Some kids made fun of her for being into country music when it wasn't as popular among her peers. It must have been really embarrassing for her at that time.
I once tripped while running to class. I was in a hurry because the bell was about to ring. I didn't see a small step and went flying forward. My books scattered everywhere and everyone around me started laughing. It was so embarrassing.
During a science presentation, I had to demonstrate an experiment. I was so excited that I accidentally knocked over all the chemicals and made a huge mess. The teacher was not happy at all. My classmates couldn't stop laughing. It was really embarrassing for me at that time but now I can laugh about it.
One example is when Britney Spears had a bit of an awkward moment in school. She was so focused on her dancing and performing dreams that she sometimes got teased for being different. Her classmates didn't always understand her intense passion for the performing arts at such a young age.