This has to be one of my all time best purchases for the Wii!!
It is called Just Dance. You have to copy the dancer on the screen. No mat is used, just the remote.
The fabulous dancers in this feature are my mom Sharon, my sister's boyfriend Ian and my 14 year old nephew James.
Oh, the person laughing hysterically.....that would be me.
And this is my Bubbaloo Jonah giving it a go: