[ame="http://www.youtube.com/watch?v=NN75im_us4k"]YouTube - Nirvana vs Rick Astley - Never Gonna Give Your Teen Spirit up[/ame]
I like this mashup better: [ame="http://www.youtube.com/watch?v=ig0BrlJYK2I"]YouTube - Usher vs Keyboard Cat - Play Him Off, In This Club (mixed by The Hood Internet)[/ame]