In my middle school me and my friends would do stuff in the bathrooms. During lunch we would mix milk with extra stuff like ketchup, chunks of salad, some sand, mayo, mustard, yogurt. Then pour it all over the sink and floor near it looking like someone puked. Every day we did it.
Then we buy brownies and mash them into a large stuff like shape and clogged toilet, leave them all over the loving floor, and lots of trails in the sink.