What if, after waking up and gazing bleary-eyed into your mirrored medicine cabinet, you open it to an overly friendly stranger's face gazing back?
That's the setup of a series of Right Guard commercials from BBDO that ran from 1969 to 1976. If the happy stranger is played by a comic genius (the recently deceased Chuck McCann) who has a wildly expressive face, dances sink-side and booms, "Hi, guy!" (which became a catch phrase), you have a winning campaign.
Of course, it also helps that the first gentleman (Richard Fiore) is a more reserved, non-morning type, who, confronted with the odd sight of his highly caffeinated neighbor, yells "Mona!" for backup.