I had two opportunities to go to prom, and went to neither. The first was when my high school class had its prom. At that time, I did not have a girlfriend, had no access to a car (in an area where you really needed a car to get anywhere), did not know how to dance, etc.
About two or three years later, my sister had a friend named Sharon who also went to our high school and she needed a date for the prom. Sharon was a nice girl, and by that time I had access to a car, but I still did not know how to dance and the prom was in the middle of my college finals. So I begged off, and never took Sharon to the prom. I am slightly sorry for this, since Sharon was a nice girl.