the best prank we ever pulled was actually the teachers fault! it was a year of double adar and R”CH aleph was right after midterms and break so no one had their books in school the first day back (last day of shvat). the teacher wrote e/t on the board for the day and was fine but for HW told us to bring in our books and calculators for class the next day. a few periods later, we got a message from the teacher that b/c tom was R”CH, we don’t have to do our HW. (had this teacher for 3 years and her policy is no HW on R”CH) OK fine. we went home that night and didn’t do our HW but we all remembered to bring our books and calculators to school. but during lunch, someone pointed out the teacher said we don’t have to do our HW…. so we decided we would bring our stuff to class but put the books under other stuff, in the desk etc. when the teacher came in and told us to take out our books, we told her you told us we didn’t have to do our HW, and part of our HW was to bring in our books…. so she had to read the problems out loud to us again.
at the end of class, she told us she liked the shtick that we did b/c she wasn’t expecting it and it also mean or a/t. and then we took out our books from where they were and she started laughing.