"We show the players the play in a diagram, then we show all the adjustments, and then if it's a play that we've run in the past, we can use our film to visually give them an example of that play," Saban said. "So they saw what to do, now they get a visual of how to do it. In some cases, some of the things that we're doing, we've never done before. So if they look at the Patriots and that's where we have to look at the film to get a teaching progression so they get a visual of how they run a route or how they're supposed to run a play, then that's part of our teaching progression."
Fog signals have also been used on railway lines since the middle of the 19th century to indicate to the driver of a moving train that a broken down train, a work party, or some other unforeseen hazard is on the line ahead. Small explosive detonators or torpedoes are placed on the track, and detonated by the pressure of the wheels of the oncoming train. The loud report of the explosion provides the indication to the driver, that in most cases requires the train to be stopped immediately. During World War II , these devices were modified to detonate demolition charges during railroad sabotage operations.
A memorable moment for Brown came in a 2006 AFC Divisional Playoff game, when the Patriots met the favored San Diego Chargers .  With 5 minutes left in the game, the Patriots were down 21-13 and facing 4th and 5. Tom Brady threw his third interception of the game, to the Chargers' Marlon McCree . Brown, making what teammate Tedy Bruschi described as a "quick mental switch" from offensive to defensive player, instinctively ripped the ball out of McCree's grasp.  The fumble was subsequently recovered by the Patriots Reche Caldwell , giving them a new set of downs. New England went on to tie the score with a touchdown and a two-point conversion, and then won the game on a 31-yard field goal. Brown also caught 5 passes for 39 yards in the game.