[ExI] silly riff on :Nature of Humor: Grinning and Laughing

[Lee Corbin]

Spike writes

>> Several books suggest that laughing, smiling, and grinning 
>> came about as evolutionary signals.
>> 
>> Question: when you are completely alone, and something 
>> strikes you as amusing or funny, do you ever smile or laugh out loud?
> 
> I do.  I have been caught laughing in an empty room.  The scary part is it
> sometimes isn't even something I saw or read, but rather just thought of
> something funny and made myself laugh out loud.  

I wonder if it's partly an extroversion/introversion thing?

Thanks for the data point,

Lee