Back when I was a teenager I lived in this apartment complex with a nice swimming pool. Spent most of each summer just hangin' out at the pool, swimming, reading, and whatever else one might do at a pool.
One day the lifeguard informed all of the tenants and people at the pool that beginning that week they would now be putting a chemical in the pool that would detect urine and that if anyone should pee in the pool a bright red ring would encircle them. There were tons of kids that swam in that pool so it was a relief to me and Hoag and all of my friends that these little kids would stop peeing in the pool or we would at least know who was doing it and could ridicule them into stopping. That summer and future summers went on without anyone ever peeing in that pool.
FAST FORWARD 15 YEARS LATER:
HOAG: "Hey, remember that chemical they put in the pool that would put a red ring around someone if they peed in the pool?"
HOAG: "It never worked"