It doesn't work.
No, seriously, trust me on this. There are many other, much more effective ways to achieve the same purpose, and you should go for one of those instead. Pulling this particular way off is a lot more difficult than you'd expect-- you have to hit the artery to have the slightest chance, that's deeper down than you'd expect, and the cutting is difficult. Ask anyone who knows and they'll tell you the same thing.
Using this method will almost certainly result in failure, which in this case will only make things worse-- really its only use is if you're just faking it to get attention, in which case you're disgusting.