Oooo we've found a rather adult sippy cup in the Zipper Cup ($40/2). While the makers of this cup see it as a symbol of bonding and friendship, hence the pair, we can only see an extension of the sexy zipper trend in ceramic form. Oh, and FYI, the green zipper looks like a weird attachment to the cup itself, but it's just a clever themed tea bag tag. If the zipper opening could save our mouths from burning, this would be a functional and bizarre design element. Hmmm.