ARA used those stupid bags in college dorms. They'd put them in and forget to cut the nipples off. Since there were never any knives, I'd stick a fork through 'em, which created a wonderful sprinkler effect. Anybody with an IQ over 110 quickly realized to simply push your glass up to collect the spray. It usually took the lunchroom janitor and several victims enough time to figure out what was going on to get a few laughs out of dorm-dinner.