Schrödinger's cat

http://en.wikipedia.org/wiki/Schr%C3%B6dinger%27s_cat

http://www.youtube.com/watch?v=HCOE__N6v4o&feature=player_detailpage#t=18s

http://www.youtube.com/watch?feature=player_detailpage&v=KFPg1tS16oo#t=40s

http://www.youtube.com/watch?feature=player_embedded&v=7SjFJImg2Z8