Beards? What are reasons men suddenly grow a beard?

Anonymous
A guy I slightly know grew a beard, another friend of his posted that he had a reason for it and made it like it was some big deal.
Nobody I know knows what she is talking about and she is being "mysterious" about it.
Nobody can ask him because he is currently unavailable online/text for a few weeks while he and his band go on a small tour.
Updates
+1 y
He still shaves his head everyday so it isn't about not wanting to shave.
And he isn't a sports fan, so not about a sports team or tradition.

I'm mostly just confused why the one friend is acting like it is a big mystery.
Beards? What are reasons men suddenly grow a beard?
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