when i was a kid, i used to go shopping with a great-uncle who would do that exact same gag with the alarm clocks at department stores, with two notable differences: 1) this was in the early 80s, when most alarm clocks were still of the two-hand, ringing-bells variety, 2) he would them all to go off at the same time
he died when i was pretty young but i have such awesome memories because of him
