Jean Sheperd came up with a fictional book entitled I, Libertine and demanded his listeners ask for it at their local bookstore to see what kind of result they would get. Eventually, I, Libertine was actually published as a result.
A famous British television commerical featured an old man using the Yellow Pages searching for a book about fly fishing by J.R. Hartley, the punchline revealing that the man himself is the author. Eventually, an actual book about fly fishing was published under the name J.R. Hartley.
When the minor-league Calgary Cannons moved to Albuquerque, the fans voted on what their new name should be. The winner was Albuquerque Isotopes, which partially references the fact that the atomic bomb was first tested in New Mexico, but is mainly a reference to the fictional minor-league baseball team from The Simpsons, which once threatened to move to Albuquerque due to poor attendance.