The Things Kids Say

So here I am, typing away at the computer when my 4 year old comes in and says "something something my butt", and I'm like "Huh, what's on your butt?" (I thought maybe he spilled something) He then looks at me with one of those "Duh" looks and says "My butt crack". I start laughing because A) I had no idea he even knew what a butt crack was and B) He's still looking at me wondering why I wouldn't know that. Needless to say, I still have no idea what he really said because he grabbed his dinosaur and went exploring.