I remember a commercial ( I think for jeans, possibly Levi's) that took place in a high school classroom. The tough looking teenage guy is not paying attention to class, when the office interrupts through the PA. They inform the teacher to pass along a message to the guy that his ballet class is canceled and that his anti-diarrhea medicine is in the office.

If anyone can find a link to this clip, I would greatly appreciate your help.

Sounds hilarious. Try searching "jeans commercial" or "Levi commercial" on google or youtube, and enter the year you remember it from. That's helped me find some stuff from time to time. Some people also upload full commercials from various channels they taped on VHS, so try searching for a channel you may have seen it on (the commercial you're looking for sounds like something from MTV or Nickelodeon from the 80s/90s). Hope you find it :D

Thanks for the advice, but I have already tried that.