I do want a Vietnamese blue beauty someday, too! Way later, though; they get twice as big as Japanese rat snakes. Fun fact: a German zoo produced offspring between a Japanese rat snake and a Russian rat snake that looked pretty similar to a beauty snake.
She hasn't rattled her tail yet. She either balls up really tight, or tries to dart towards an escape. Most of the time she's running around and looking for an angle to watch me from lol.