Not worth it
In the early 80s, as part of their "It's Worth It." campaign, Maxell and their ad agency hit on a dramatic if exaggerated visualization of the sound quality of their cassette tapes. Never mind that it's really more of a depiction of stereo's quality than the tape's. The point is that it got the message across and was in fact, so popular that the image became a poster on many a dorm room:
Adding to its iconic nature was probably the accuracy with which it depicted its target audience: Not only was it iconic and aspirational (what more do you need in life but alcohol and big speakers?), it also portrayed its target audience with uncanny accuracy: Slouchy young men fixated on looking cool at all times.
(By the way, contrary to a popular belief on the internet, that is NOT Peter Murphy of the British rock group Bauhaus. Murphy appeared in the original UK versions of the ad, shown below:)