I thought the correct answer would be, "No time for programming, too busy pushing a boulder."
Though, since the whole thing was a punishment, I have no idea what the punishment for not doing his punishment would be. Can't find it specified anywhere.
The version I like the best is that Sisyphus keeps pushing the boulder voluntarily, because he's too proud to admit that, despite all his cleverness, there's something he can't do. (Specifically, get the boulder to stay at the top of the mountain).
Here's the new thread for posting quotes, with the usual rules: