Why do guys bounce their legs when talking to a girl?

Anonymous
I've heard so many theories, but am not sure what to believe.

I was talking to a guy yesterday for a number of hours, we recently met, and we like each other, but are just getting to know one another.

For probably about 85% of the time that we were talking, he was continually bouncing his legs.

His legs were not bouncing while he was in conversations with others, or when he was not talking to anyone, in between conversations.

So guys; what causes you to sometimes bounce your legs while talking to a girl? Why do you do it?
Why do guys bounce their legs when talking to a girl?
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