3. Water Would Turn A Different Colour If You Peed In It
This is sort of a good idea but it's not at the same time, because we're all guilty of peeing in pools... In an attempt to stop you from peeing in pools as a child, because it's extremely unhygienic and disgusting, your parents would tell you that the water around you would turn into a different colour to alert the lifeguards of who is the culprit. Everyone would know that it was you, and you'd have to get out of the pool to chants and taunts from fellow swimmers for being the pee pee kid. And no one wanted to be the pee pee kid.
