Oh...my...word.
I don't think any amount of practice could put me anywhere near that, so I'm going to hide my insecurities and try to pretend that the person who did that doesn't have a life so I can laugh quietly in my head.

Seriously though, dayum.

That's Stepmania Online not DDR. o_O It's easier with fingers than with feet.

OK, Stepmania makes it better. But still. OMFG WTF!