My cats do the same exact thing to my wife. They tried laying on me once. No, I didn't smack them or anything I'm so skinny I guess they kept falling off. They don't bother anymore. LOLA
Ther only reference i have is from a horror move with a gnome(or somthing) that would steal breath. The cat was the hero and killed the gnome. Apperently cats are a natural predator of gnomes. Any1 seen this?