Yea my smallest girl just did that to me yesterday when I went to clean her tub. In her defense she was all curled up in her hide, so I just ripped the hide off and boom she's out in the open. She was more aggressive than any hatchling I've seen on youtube about aggressive ball pythons. Then she vibrated her tail and instead of it scaring me it just made me realize, "haha she's not dangerous at all".