"You're just glad you have your helmet on." That's how New England Patriots receiver Brandon LaFell describes being part of quarterback Tom Brady's head-butt celebrations. There aren't many quarterbacks in the league who show as much emotion as Brady does, especially after a score, and the 37-year-old signal-caller tends to head-butt his teammates when he gets fired up. Well, turns out Brady's teammates are more fearful than excited when they see him running over to them to celebrate. A few Patriots players talked to The Wall Street Journal's Kevin Clark about what it feels like to be on the receiving...