. "Major football leagues such as the NFL and NCAA have taken a tougher stance on helmet-to-helmet collisions since US Congress has launched an investigation into the effects of repeated concussions typically suffered by football players. Many players criticize bans on helmet-to-helmet collisions on the basis that gridiron football is a game that is supposed to be composed of the world's biggest and best athletes, and placing such restrictions \"waters down\" the game."@en . . . "Major football leagues such as the NFL and NCAA have taken a tougher stance on helmet-to-helmet collisions since US Congress has launched an investigation into the effects of repeated concussions typically suffered by football players. Many players criticize bans on helmet-to-helmet collisions on the basis that gridiron football is a game that is supposed to be composed of the world's biggest and best athletes, and placing such restrictions \"waters down\" the game. An image of two helmets colliding and smashing had been presented on Monday Night Football for more than 20 years. This was removed in 2006, as a crackdown began on such activity. The NFL also ordered Toyota Motor Company to stop using such footage in its advertisements."@en . . . . "Helmet-to-helmet collision"@en .