Reminds me of a friend of mine whose teenage son had been looking at porn and decided to print out a still from a favourite scene, for, er, later study. Only the printer wasn't working, so he gave up...except when his mum came home it *was* working again, and the first thing it did when she fired it up was print out the last file that had been sent to it...
Lesson: whatever dodgy stuff you're looking at, leave the damn printer out of it!