Break it.

and it was from a barrel with worms =\ no, seriously, I saw it on TV... there are these yellow carts with kvass on the street, right? well, they checked one, and it turned out to be some kind of garbage, with worms and stuff floating around... maybe it's old and not cleaned, or maybe the kvass is just bad, I don't know.
anyway, don't drink street kvass, you'll be better off! :D

I'm taking a shower... :O