Smooth like sandpaper.

Yeah, the ones I'm talking about shatter. Think of very thin styrofoam. And I've never seen a school with plastic or glass ceiling tiles, schools don't spend money on IMPORTANT things like INFRASTRUCTURE! That'd be ridiculous!

I can 100% confirm that it is possible because it happened not 2 weeks ago in my biology class

It could just be that the tile got jarred out of place, causing it to fall and break

I go to a school that was built in the 1930's (never renovated except to to add new AC and pipes) The ceiling tiles fall off weekly so our little old janitor comes out and puts it back up. They are styrofoam that's less than 1/2 inch and easily break apart

They would prefer to spend money on the sports team

^exactly! Our STEM extracurricular activities have literally 0 funding. They are closing down all of those clubs.