halogenic:

Chris Burden – Prelude to 220, or 110 (1971)

Burden lay bolted with copper bands to a concrete floor, near two buckets of water in which live 110-volt lines had been submerged. Had anyone visiting the gallery chosen to spill the water, Burden would have been electrocuted. Such performances created a context in which it was possible (though not probable) that the artist would die. Fear or pain, Burden said, “energize the situation,” and that energy was his subject.

(Source: C. Carr, «On Edge. Let’s Make an Ordeal—Young Artists Recover the Conceptual ‘70s in the Material ’90s,» 1998, http://www.villagevoice.com/issues/9849/carr.php)