The Skinner Box was a cruel joke for Burning Man 2011. It is an exercise bike that randomly dispenses alcohol while you're pedalling it. It uses a full gamut of video game tricks -- flashing lights, happy/sad beeps, incremental progress feedback -- to make itself as addictive as possible. These are demonstrated in the video below.
The Skinner Box also made an appearance at the 2012 Barbot event.