This morning I found a nifty bookmarklet at that allows you to turn any website into an old-school game of Asteroids.
You control the little ship using the arrow keys, space bar to fire, and shoot at the various elements of the page – which disappear as you hit them.

I recorded a screencast using as an example. It's a bit difficult to make out the ship. But if you change the video resolution to 720, and view it in full screen, it's a little better.

(If you click here, you can try it out on my blog. *gasp*)

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