When I started my first job as a cashier in a supermarket, I got really flustered when an old lady asked me a question about a discount coupon. I didn't know how to handle it at all. I called the manager over, but in my haste, I accidentally pressed the wrong button on the register and almost charged her double. She was not very happy and I felt so embarrassed.
There was this time I went to a new restaurant. I was so excited about the food that I didn't realize my zipper was down the whole time I was ordering. When I finally noticed, the waiter was giving me a really strange look. It was so embarrassing.
Sure. I worked in a clothing store for my first job. A customer asked me if we had a particular shirt in a different size. I said yes without checking properly. I went to the back to look for it and of course, we didn't have it. When I came back and told the customer, they gave me a really disappointed look. I felt so bad and stupid for not checking first.
Once, a boy was bathing and he accidentally slipped on the soap. He fell with a big splash and his towel that was hanging nearby also got soaked. He had to wrap the wet towel around himself and run to get a new one, feeling very embarrassed as his siblings were outside the bathroom and heard the whole commotion.
I was in a crowded elevator. A woman accidentally farted. It was silent but smelled awful. She tried to play it off by coughing loudly, but we all knew what had happened. People started fanning the air with their hands.
There was this time when I was in a public restroom at a shopping mall. The toilet paper roll was empty and I didn't realize until it was too late. I had to call out to the lady cleaning outside the bathroom to pass me some toilet paper. It was so mortifying, especially when I heard other people in the restroom giggling.
When I was going through puberty, my voice started changing. It would crack at the most inconvenient times. I was in the middle of a class presentation and my voice went from normal to a really high pitch all of a sudden. It was so funny in retrospect but at that moment I wanted to disappear.