“Rosabelle — answer — tell — pray, answer — look — tell — answer, answer — tell.”
Harry Houdini (1874–1926) Austro-Hungarian born American magician, escapologist, and stunt performer
The secret message http://www.magictricks.com/houdini/seancehistory.htm devised with his wife to test spiritualist séances should he or she die. In their secret stage-code it spells out the word: "BELIEVE". Quoted in Death and the Magician : The Mystery of Houdini (1981) by Raymund Fitzsimons, p. 166