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I'll admit I didn't read the link, and that this may sound odd, but learning to solve a Rubik's Cube is fun...

It might not sound useful at first, but what I do is keep one on my desk at work. I use it like a stress ball. When I need a few minutes to get my mind off things or just jump start my thought process I mix it up and solve it. Now that I can consistently solve it in about 3~4 minutes it makes a great little distraction.
 
I'll admit I didn't read the link, and that this may sound odd, but learning to solve a Rubik's Cube is fun...

It might not sound useful at first, but what I do is keep one on my desk at work. I use it like a stress ball. When I need a few minutes to get my mind off things or just jump start my thought process I mix it up and solve it. Now that I can consistently solve it in about 3~4 minutes it makes a great little distraction.

Wow, as soon as I seen the thread title I was going to suggest the same thing. I used to be really into it. I could solve it in less than 20 seconds on average. I guess it's not useful at all though. Actually its probably one of the least useful things I have ever done. It was fun though.
 
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