The real reason for running Windows 7 is this free app.

What does it do? It makes copying and moving files a whole lot more fucked up fun!

Your standard blue progress bar turns into a rainbow with a kitty running across it, wearing a pink cracker. Let me rephrase that:

Find the app here. Find a little screencast I did showing its functionality here:

And people wonder why I work with computers. Tscha.

edit: I didn't know this was an Internet fad. Check out the vid of the original Nyan Cat, which has apparently garnered some 24 million hits on YouTube at the time of my writing this.