Judge Orders Deleted Emails Turned Over
TrueCrypt can do this with encrypted volumes. You can have it create a hidden volume within another encrypted volume, but using a different password. You can store all your porn in the hidden volume, and all your incriminating stuff in the main volume. When forced to give up your password, give up the password to the hidden volume and they just get a load of porn. Because of the way TrueCrypt is built, it's impossible to tell that there is another volume present, or that the password given is the password to the hidden volume and not the main volume.