10. Finally (!!) getting to another level.   9. Killing your arch-nemesis.   8. Rolling a Natural 20 and then blowing the head off the guy who already has his gun in your face.   7. Riding up behind that sniveling NPC in the dark and slicing him into two pieces... both dead.   6. Having a storm flare go off and kill all the vampires in the immediate area.   5. Taunting NPC's.   4. Playing fetch with a canine you've summoned.   3. FINALLY (!!!) not rolling a 1 or a 3!   2. Natural 20's (in general). and the #1 Natural High in Rifts (in my experience) has been...   1. Rolling a Natural 20 when attacking from behind and getting 4x damage!!