My 8 year old sister has been watching my old Mary-Kate and Ashley tapes and I had forgotten how laughably bad the "musicals" are.
This clip is hilarious. It's from a Mary-Kate and Ashley movie. They are rapping in the bathroom at a high school dance about how much boys suck and doing embarrassingly bad dance moves. I actually felt embarrassed for them later in the video when they are doing what looks like a beginners line dance and the camera keeps zooming in on their faces because neither one of them can dance.
Ashley looks really into the whole thing (severely overestimating her abilities) while Mary-Kate looks embarrassed to be a part of it. I think that pretty much sums up their whole career though!
What's All The Noise About Boys
Here's another one from one of their movies, showing off their "dance skills."