Check out my smokin' pink ring.

This is a teardown and circuit analysis of a small USB powered floating water atomiser. when you sit it in a glass or dish of water it produces a fine stream of ultrasonically generated mist.
The circuitry is shown in the video, but I'm not sure about the way the step-up transformer has one side of the secondary connected to the MOSFET drain connection as opposed to the circuits ground (or isolated completely.) Any thoughts about that?
Neat little device though.