And the dialog says it all.

Me: Oh. My. Gosh. Do you see this??

Ricky: What IS that??

Me: It looks like poop. She wiped poop on the wall.

Ricky: No, it can't be poop. It's got to be chocolate or something.

Me: It's not chocolate. Where would she get chocolate? It's poop.

Ricky: It can't be poop.

Me: Smell it, then.

Ricky: Noooo, I'm not gonna smell it, YOU smell it!

(enter Ellie)

Me: Ellie, what is this on your wall? Is this chocolate?

Ellie: No, it's poop.

Ricky: She's lying, it can't be poop.

Me: (smells the wall) Yeah, it's poop. Our child wipes poop on her bedroom wall like a monkey. This is disgusting!

Ricky: Where did she get poop from?

Me: From her butt, Ricardo, where do you think??

Ricky: Eew, that's nasty.

Me: Yes. Yes it is.