It depends, mostly in the driveway...late at night when no one is going to be watching...and usually it's either Caramelldansen (does that even count? 0_o ), trying to imitate Mumble from Happy Feet, or the Time Warp.
I do try actual dancing once in a while but with my current lack of a reasonable social life I have no need to. Plus I worry about my mom catching me in the act so to speak, she caught me trying to learn the oompa loompa dances they had little tutorials for on our Charlie and the Chocolate Factory dvd (Tim Burton version) once and laughed so hard she had a mild asthma attack. =_=;