Otto Bites Off His Own Tongue (Season 5, Episode 13)
Big Otto Delaney, an imprisoned SAMCRO member played by series creator Kurt Sutter, suffered plenty during his time on the show, but perhaps his grisliest punishment came by his own hand, er, teeth. After tricking Tara into bringing him his dead wife's rosary — which he used as a weapon to kill a nurse in order to make his testimony in the RICO case against SAMCRO worthless — Otto is threatened by the nurse's brother, former U.S. Marshal Lee Toric and forced to testify. However, when he's being interrogated, Otto bites off his own tongue and throws it at the interrogation room's glass window where Toric can see. As Toric notes, you can't fault the guy for his commitment.