This i found really interesting (from PSFK)
A team of designers have created the DRM Chair as a 48h-long project, from concept to final video shooting. The chair can only be sat on eight times before it self-destructs.
This limited use builds on the concept of piracy, as Digital Rights Management is often used to protect content after a certain number of downloads. This was applied to a physical object so the chair, like a piece of content, is unusable after a certain number of times.
The DRM Chair was made by Gianfranco Baechtold, Laurent Beirnaert, Pierre Bouvier, Thibault Brevet, Raphaël Constantin, Lionel Dalmazzini, Edina Desboeufs, Arthur Desmet, and Thomas Grogan, as their final entry for the global design competition The Deconstruction.
A small sensor in the chair detects when someone sits on it and a counter reduces its number each time to signal how many uses are left. When it reaches zero, the self-destruct system is activated and the structural joints of the chair melt so it collapses. You can check out the chair in action in the video below: