Bing!!

My funny little boy is at it again. I was asking him some questions the other day like, what is this?...Apple, What is that?...tree, What is this?...he pauses...then says, "BING!" So I tell him the answer and he repeats it. Now I am working a theory and sure enough, if he doesn't know the answer he says, "Bing." LOL next question please...I'll take animals for 200. LOL I have no idea where he got that from. Cracks me up to no end though.