How did tommy flanagan get his glaswegian smile?

Tommy Flanagan, the Scottish actor known for his distinctive "Glaswegian smile," has a facial scar that he acquired in a bar fight when he was younger. The scar runs from his lip to his ear, giving him a unique and memorable appearance. He has often embraced this feature, which has contributed to his tough-guy persona in various film and television roles. Flanagan's story highlights how personal experiences can shape one's identity and public image.