St John Ambulance, Bartle Bogle Hegarty

Sami Shah is boning up on his Heimlich technique after seeing this St John Ambulance ad: "If any work of fiction can persuade parents to learn first aid (and keep a closer eye on their kids), this traumatic spot with a bitter twist is it." It was created by Rob Ellis and Alex Ball, and directed by Dougal Wilson through Blink.