Here's another "I Looked At The Internet Today So You Don't Have To" feature.
Heard of "Gangham Style" by Korean Pop Star Psy! yet? You should probably take 4 minutes and laugh your tail off watching this. Or perhaps it will motivate you to dance your tail off.
And if you need explanation, Nightline spells it all out in a way people over 40 can understand.
Hear the song on Youtube.
See "Nightline" on Youtube.