lol I have no secret! When Rosie decides she wants to do something, she'll wait until she's completely ready and then take off. She did that for crawling and walking, too. When she started walking she went from barely cruising to just getting up and walking around, without the in-between bowlegged walk that they usually do.
Hopefully I'm not jinxing myself by bragging on her... hehe.. but last night she even went on a public toilet.