Everybody and his kid brother knows more about this subject than I do.

Today it was announced that Rob Gronkowski,
after three Super Bowl wins with the New England Patriots,
has retired from pro [US] football
at the ripe old age of thirty years.

Of course, the Gronk has sustained
a list of injuries as long as your arm. Concussion included.

The Gronk has been described, personality-wise,
as the human equivalent of a Golden Retriever.
It's no secret that he loves a good time and a party.

I don't know if there's enough Gronk, however,
for a thread all to himself.

So, why not open up the thread to US pro football in general?
And the players who make it memorable?