The Twittering Office Chair
http://www.instructables.com/id/The-Twittering-Office-Chair/

This is very cool. The guy over at http://twitter.com/newlywedsontjob used this how to as his starting point!

The Twittering office chair "tweets" (posts a Twitter update) upon the detection of natural gas such as that produced by human flatulence. This is part of my commitment to accurately document and share my life as it happens.