I am not a lawyer but for whatever it might be worth you might look at it from a "hostile environment" point of view that would have some teeth especially if other employees have similar videos on you tube that violate policy and you are the only one being singled out.
I would also (me being me) get a poster of the constitution and mail it to the boss along with my resignation, but thats just me and I dont recommend that for anyone but myself.
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Molon Labe
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