Just like you can block pop-up ads on your computer, you can also buy software to block porn, if you wanted to do that for some odd reason. But that very software has to have its own ads—preferably ads that incorporate porn, for clarity's sake! You can see the quandary. One German porn-blocking company solved the problem with some strategic Photoshop work [UPDATE: A concept pioneered at Something Awful], and the result is so creative you almost want to buy their purifying product just to applaud the effort (not really). Two of the company's ads, via Copyranter, are after the jump. They're perfectly SFW, as long as you don't use any imagination.