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And, of course, Michael Vick.
Since entering the NFL with the Atlanta Falcons in 2001, Vick has caused nightmares for nearly every defensive coordinator in the league.
He blossomed into one of the deadliest players in the league.
Then it all crumbled down.
In August 2007, he pleaded guilty to federal felony charges involved dog fighting and served 21 months.
Immediately after his release, Vick was the target of public scrutiny, however, he successfully rebuild his image.
He has found a new home with the Philadelphia Eagles and the past season, he shows he can return to his old form and has even shown improvement as a passer.