When you go to the pool or lake to swim, you'll see a flag stuck somewhere in the water. That flag is there so you know it's okay to pee in that area of the pool. Everyone knows urine dilutes in water, and if everyone just pees in one place, it won't be gross. So go pee over by that flag when you have to go. Don't bother getting out of the water.
Right as you start to pee, you hear the life guard start to yell, "NYOOOOOO! (にょう)" and he's pointing at you! You were just peeing by the pee flag! Why is he mad?
Currently there are no similar looking kanji which exist in the WaniKani learning system