There was a pretty interesting comic I read about a girl who is turned into a statue so she can spy on a villain, but gets thrown away or something.
She copes by creating an imaginary friend and then making elaborate fantasies, with her and her friend acting out the parts. At one point one of the fantasies is of her friend realizing that the statue girl is her imaginary friend and having to let her go and move on.
So I figure being trapped like that would probably make you make up shit out of boredom and escapism to a massive degree, to the point where if you get freed you might be completely schizophrenic and delusional.
(Eventually they find her and transform her back, at which point she announces her plan to defeat the villain that she's had a LOT of time to think about.)