Most people say to do artificial harmonics by using the fingers on your pick hand. Ive tried that for about a year and still manage to actually pull it off maybe one time out of 10000000000. Another technique is to use the side of your picking hand. Pick the string that is to be played and lightly place the side of your hand over the vibrating string. This should cause a good deafining screatch that everyone sitting within a mile of you will love to hear over and over again.

Again dont forget to max out the distortion on this one.
:cool