Be subtle. Say it without having to actually say it :)
Stop talking please. Or, please stop talking. Whichever side you begin with, the message is loud and clear!
Moments you may need them: - Your coworker talks too much. - Backseat drivers. - When someone tries to hit on you at a Tove Lo concert (my true story). - When the person sitting next to you at the movie theatre is narrating the entire movie (this is also a true story). - Buy some and tell me yours!