Smooth as....

Today, I heard this while enjoying a cupcake at Billy's

A small boy to a man (his uncle?)
You have a beard!

The man (his uncle??)to the small boy
You have a beard!

The small boy
No I don't! You do.

The man (his uncle??!)
No, you don't. Your face is smooth. Smooth as a butt.

This was made all the more interesting/forgivable by the fact that English was not either one's first language.

I don't go to Billy's that often.