Can tu belive this?

I do not watch how i met your mother, though i have seen it advertised and it looks funny. I would watch it, but when it's on i'm usually on my way back from work and miss it por around 5-15 minutos depending. I also do not own any of the wii games as i do not own a wii.
However - for your pregunta as to why the creators of just dance added this song in preguntas i would say that they have exhausted all what they term 'dance-able' songs and are now turning to something that has a half decent beat tu can tap your foot to and oscilación your arms around in complicated movements.
Unfortunately dancing with a wii control and in a small available el espacio such as bedroom and living room doesn't really help with the adding of moves, and i often see moves repeated whilst watching my friends play.
Also tu have to think about popularity of songs and the shows/artists they come from. Most dance and song games for any console are polled por how many vistas a mostrar has received, how many albums have been sold of a particular artist and what is 'in' at the moment with the 'young ones'.
Console games such as the wii dance games are targeted for teenage girls mostly and teenage girls listen to rihanna and britney and what not so that's the songs they mostly play. They add a few extra to make it look good, put on an advertisement where groups of people of all ages are dancing and viola tu have sales.
It doesn't have to be good, as long as people buy it.

sorry... got NO clue!