Glasgow smile

A Glasgow smile (also known as a Chelsea smile, or a Glasgow, Chelsea or Cheshire grin) is a wound caused by making a cut from the corners of a victim's mouth up to the ears, leaving a scar in the shape of a smile.

The act is usually performed with a utility knife or a piece of broken glass, leaving a scar which causes the victim to appear to be smiling broadly.

The practice is said to have originated in Glasgow, Scotland in the 1920s and '30s, but became popular with English street gangs (especially among the Chelsea Headhunters, a London-based hooligan firm, among whom it is known as a "Chelsea grin" or "Chelsea smile").