Undoing INSERT COIN and Related Ideas
YOU CAN FIND THE ORIGINAL POST HERE.
Wow. This post has seen more than 50,000 hits in less than two days (UPDATE: it has now exceeded 110,000 in three days). To say that it was unexpected is completely insufficient to describe my reaction. In any case, thanks for sharing my fun. And that's exactly what this is meant to be, fun. Not malicious, not mean-spirited, not damaging in any way. Almost all the comments I have received reflect that spirit. There are a few, however than don't make me smile (and didn't make the comments page).
First, if you came here because you were "hacked" there is an easy solution. Power-cycle your printer. That is, turn it off, wait a few seconds, turn it on. The program uses a documented, supported feature of HP's product to do something very ephemeral and undoing it is as easy as a restart.
Second, please have fun but think before you act. If it is against the culture of your office enviroment to have this sort of fun, consider not trying. You will be the only one having fun. More serious may be a violation of your company's Acceptable Use Policy which could get you in real trouble.
So, please, practice "safe hacking" and use your entire brain when choosing how to use this information.