Why do some guys start wiggling/shaking their legs (while sitting) when they see you?

Jxpxtxr
This happens to me a lot like I notice it when I'm walking past guys or at a coffee shop and the guy sitting on the table next to me is looking at me and then starts to wiggle/shake his legs (example).
Who do some guys do this?
I honestly feel so weirded out whenever it happens.. Like they are struggling to control their legs or something.. Why? šŸ˜³
Why do some guys start wiggling/shaking their legs (while sitting) when they see you?
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