The top knob was for the three or four channels your giant antenna actually brought in. The bottom knob was for entertaining yourself with machine gun sound effects.
When I was a kid if a dog ran up and started barking everyone immediately assumed the dog wanted to lead them to the scene of an emergency. And they were right like 53% of the time. Dogs this generation have really slipped.
Throw up a hand if you remember getting your high school textbooks and immediately checking to see who had each one the year before you. When it was a popular person, that was always a good omen. Instant karma boost.