Unleashing my imagination is a terrifying idea. I have multiple safeguards in place to keep even the relatively harmless bad and dangerous ideas that live in my imagination from being able to escape.
Yes, I remember at least one case [1] where that caused some issues :-).
http://www.imdb.com/title/tt0420223
http://www.imdb.com/title/tt4680182
http://www.imdb.com/title/tt1727770
The reified imagination genre is rife with unintended consequences.