This has been killing me to the point that I don’t know whether it’s real or a dream. I saw this in the 80s, probably on HBO since that was the only channel of that type we got. It was a short film about a “nerd” who apparently wanted to impress some girl, so he did something with a video camera to “beam in” to her family TV to deliver a message or something. It was very strange. And no, it is NOT “Closet Cases of the Nerd Kind,” which is, evidently, the only thing that comes up when you google “HBO,” “short take,” and “nerd,” etc.