Olivia: I see Riley's poop in the grass. Why is she [sic] poop in the grass?
Me: Because animals poop outside.
Olivia: Like sheep... and giraffes... and little giraffeses. I poop in the potty.
(Usually there is more "why?" followup from her, to the point where we could fund her college education if we had a nickel for every time we start a sentence with "because.")