You do not want to fail one of Bill Belichick's pop quizzes. (Getty Images)

Bill Belichick has long been one of the best coaches in the league, but also one of the most unusual. He's known for utilizing game-plan specific strategies on both offense and defense, often discarding plays and even players at a moment's notice.

According to the Wall Street Journal, we can add another to the long list of Belichick's quirks: he gives the New England Patriots the toughest, most random pop quizzes -- quizzes so tough that cornerback Kyle Arrington said, “You just have to Wikipedia, Google, SportsCenter, use your ESPN app, something,” just so you're not caught unpreprepared.

Former Patriot and current NFL Network analyst Heath Evans said of Belichick, "He’s stopping and asking me about a player on special teams. ‘Can he wiggle? Who did he match up against last week on kickoffs and how did he win that matchup?’ There’s no limit to the knowledge Bill expects you to have on an opponent and the craziest part is he has the answers to all of it.”

Belichick also apparently has a practice of asking a young player on the team for an answer to one of his questions, then going to a veteran at his position to see if the vet concurs with the young player. Lately he's started doing the opposite, asking a younger player on the team if a vet is correct. Tavon Wilson said, "He tries to find different ways for us to answer the questions.”

And when a player gets a question wrong? “It’s a chill silence for a few seconds. Bone chilling, at that,” Arrington said. “If he doesn’t move on from there, and he’s just looking at you, oh yeah, it’s pretty awkward.”

Somehow, this is not at all surprising. Sounds like classic Belichick psychological warfare.