yes a few of the bb freaks have tried and all failed.
shahbaz
http://www.people.co.uk/news/tm_head...name_page.html
dawn bb 7 (the one with the serious bo problem)
she claimed she was held against her will because she asked to leave after receiving what her family claimed to be important information about her sister being very ill turned out to be nothing more than a message from the outside world to tell her she wasnt very popular.
As it was she was ejected for the rulebreak but this was shortly after she said she wanted to leave and bb told her arrangements were being made and to wait until morning.
bb didnt let her leave on the spot so she tried to claim she was held against her will
http://news.bbc.co.uk/1/hi/entertainment/5016618.stm (story of her getting the boot)
she then went on a very public hunger strike demanding police release footage of her being badly treated so she could launch legal proceedings she was given every second and nothing was ever heard of the freak again
http://news.bbc.co.uk/1/hi/entertainment/5032984.stm