Trust Your Cat?

My mother had a Siamese cat that lived over twenty years. When I was a little boy, this gorgeous animal would come nuzzle me, purring in seemingly absolute contentment. Then this mercurial fellow out of nowhere would nip me with his razor-sharp teeth. Mom would say "that's a Siamese for you", but from my experience, many different breeds of feline will turn on a dime from a loving playmate into a biting nightmare.