A childhood belief about tv

Back when I was two years old, I was afraid of my paternal grandfather when I was young because he was tall and intimidating. He also worked for his local PBS station. As a result, I used to think the PBS logo (the thing that looks like a dead-eyed bald head?) was a psycho killer hired by my grandpa because it looked exactly like him. It would stab me with that second head thing (?) to the right of it and finish the job with its sharp pointy nose, but if I looked at it in the mirror it wouldn't come out of the TV and hurt me. I also thought that if I didn't look at the right side of it, it wouldn't slice through the TV to destroy me. And when the announcer guy said "This is PBS," I thought it was the head thing's name, and the voiceover was introducing it. This fear persisted until I accidentally looked at it and didn't get stabbed.