This is cool and it's one of my favourite types of projects - where you have to hack your way through security to pull off a prank. However, I think it would be better and more impressive if the author limited the collateral damage. Spawnkilling other programs is an effective way of protection, but I think it disturbs people too much by interfering with normal (for a technical person) computer use.

Interestingly, the author pretty much delivered half of a Malware Writer 101 here. I had to deal with methods like these when removing crap from non-tech computer users more time than I would like.