We got some new stemware (yes, I said stemware) for Christmas this year. For a day, all our other cups were dirty, so my wife just used a wine glass instead to get a drink of water with. Since she'd already used it, she spent the rest of the day, refilling it, and carrying it around. It was funny to see my wife walking around the house with a wine glass in her hand like some classic Hollywood film noir lush. Especially since the glass was never filled with anything stronger than ice water the whole time.
But now, I find myself doing the same thing. It's so much easier to remember which glass is yours that way.