Butter or Not?

Behold a lovely lump of butter made from a half-gallon of Cookie the Cow's cream. Golden, eh?

I kneaded it over the sink to clean the buttermilk out. This way the butter keeps longer.

Gee, I I wouldn't want to waste any of the butter crumbs that fall in the sink! I had better pop them into my mouth.

Oh. Except if the third butter crumb I pick up actually happens to be a flake of dirty cellulose sponge.

Yes folks, that's a piece of sponge masquerading as a tasty dairy product. Clean your sink before you knead butter, that's the moral of this story.