Teacher had her spectacles up on top of her head and distance glasses on her nose. Teacher tells class she can’t find her glasses. Total pandemonium as we all scatter to all corners of the building to look for them.
Not a teacher prank, but it was common on the first “in shabbos” of an out-of-town high school to tell a freshie to open the aron kodesh for Anim Zemiros (not said there). The mizrach vant learned over the years how to read the body language