I’ve released ten twitter-length IFs – the Inform 7 source code for each is 140 characters or less (counting spaces but not tabs or carriage returns). The games, with links to their source codes and to Parchment for online playing can be found at http://saucersofmud.wordpress.com/2010/04/14/ten-very-short-interactive-fictions/.
Eight of them are in a linked series. Hope they provide you with about thirty seconds of amusement each! (They were mostly inspired by Jack Welch’s TWIFcomp, though there are too many for me to enter them all.)