>> Why is that weird? The LED doesn't care which leg is connected to the
>> logic output pin, it's just a voltage. You could even connect the LED
>> between two output pins*, then it would only turn on when one was high
>> and the other was low.
>
>
> There's even a name for that trick: Charlieplexing.

Cool - is there also a name for when you connect a tiny speaker to two 
output pins and give one pin a square wave, and the other the inverse of the 
square wave - to make your speaker 2x louder than everyone elses? :-)

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