Elise Amendola/Associated Press
The offseason of Tom Brady has officially begun in earnest.
New England's impending free-agent quarterback had social media back in detective mode Thursday evening with a cryptic tweet featuring a picture of him in a tunnel walking towards (or away from?) a football field.
Does it signal the end of Brady's career? Does it mean he's leaving the Patriots? Is it just part of a Super Bowl ad? Did Brady just like the way his silhouette looked in the black-and-white photo?
All possible answers are on the table, and Twitter will not rest until its sleuths have explored every angle here.