I hadn't realized that Zac was paying such attention to what I was telling Tyler but he finished his teeth and looked down at Tyler to say "You need a new butt". Tyler was very worried and relied, "Noooooo". I asked Zac why Tyler needed a new butt and he replied "Because his is broken".
At first I thought he was referring to the joke that goes: Hey, is your butt broken, cuz it has a crack in it! He surprised me though and said very matter of factly, "It's broken because it doesn't work on the potty". I giggled!