Different sports have different rules, practices, and little idiosyncrasies that might seem super strange to outsiders. Pro soccer players flop to the ground whenever so much as a gust of wind crosses their path. And tennis players let out a grunt/moan whenever they launch a serve.
And if you’re an avid NFL fan, you may have noticed that refs seem to have a penchant for throwing their hats, but why do they do that?
Source: https://www.distractify.com/p/why-do-refs-throw-their-hats