As there is no better way to mess a machine up that to go rampaging through the registry changing things, a rogue user accessing your registry remotely could prove disastrous.

He likens the sudden awareness to the feeling you get when you wake up after a long night carousing, the lights go on, and you realize you're a mess.

Therefore, if you don't remove it now, the next time you go to the site it will still be in your cart and might mess up the next script that runs.