Background pic:
http://klaxa.deviantart.com/art/Rainbow-Dash-Wallpaper-268000869

Full video at:

Eizen:
http://www.dailymotion.com/video/x1ctpcp_let-s-react-to-mlp-fim-s4-e10-rainbow-falls_fun

Bohepans:
https://www.youtube.com/watch?v=iW6SBYRdM2o