Steve Vai:

Another Eventide H-3000 monstrosity. Alien in this case being a creature from a semi-unknown origin, the water kiss being an electro-magnified event based on the incredible ion level generated from the overstimulated magnanimous hormonal insatiability glands of the subterranian being in question. It was improvised in one take.

Source: Steve Vai – Passion & Warfare (Guitar Recorded Versions)