Oh absolutely. Volume has to be completely off.
Be mindful or have a cool boss. Kind of funny my current boss is very into sports and watches a few football games per year. Thinks it makes him a "soccer fan".
Pretty sure that if he walks past and sees me watching Russia - Saudis tomorrow, during work hours, he's gonna be all "oh World Cup...cool, man...when does the US play?" :

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:depressed