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In page Leigh Matthews:

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Matthews' earned the nickname "Lethal" for his reputation for giving (and taking) very hard bumps, and in 1982 this reputation was enhanced to the point of legend when he famously collided with a behind post at Windy Hill and broke it.[2] A piece of the post (measuring about one metre) broke off, hitting the boundary umpire, after Matthews ran into its base. It is believed that, to comply with a VFL directive, groundsmen at Windy Hill had glued an extension to the top of the post which broke loose after Matthews collided with it. At the time, commentator Lou Richards called him a "He-Man" due to his large size and strength.