['That must have been terrifying.', 'What would you have done in that situation?', "Sorry I was thinking aloud of the moment when I was mortified. When I was in elementary school my skirt ripped in front of the whole class and my teacher didn't want to help me!"]
Just be glad that everyone in your class probably has no memory of it now.
Once in elementary school my skirt ripped in front of the whole class and I was so mortified. I even asked my teacher for help and she didn't want to help me!