For beauty purposes and to live longer, Michael Jackson used to sleep in an oxygen tent. He later donated the bed to a Californian medical center as a therapeutic aid for burn victims.

NOTE: In an interview with Oprah, Michael Jackson denied sleeping in this bed; according to him, he donated a million dollars to a foundation who bought the bed. He then saw that strange piece of technology, tried it on, somebody took a picture and that is how the rumor started. Thanks, Björn.