Watched paint dry. No, really!
I'm doing a beadmaking technique that I've never tried before, with transparent clay and paint, and I can't move on to the next step until the pieces I've painted have dried.
... Actually I got a bit bored with that, fairly early on, and hung around the craft store at the shopping centre for awhile. Then I called in at a hardware store and bought some clear-gloss floor & furniture finish.