xkcd is, of course, the "webcomic of romance, sarcasm, math, and language", written and illustrated by Randall Munroe.
Recently, Randall drew a single panel comic called Time. It was just a guy and a girl resting on what seemed to be a hillside. About every half hour, the comic would get a slight upgrade. This has been going on for a week, and we've discovered that the hillside is actually a beach.
If you want to keep up with the panel, you can find it here.
Somebody put the panels together into an animated .gif, so you can find out what you missed here.