Made me think of my very early PIR for external lighting. A very old man being inquisitive asked what i was doing. I exsplained the PIR would see him and turn his light on. He replied that he had heard some tall storys in his life.
Another occassion was my first fax machine which i clearly didnt think through. i payed a fortune before i realised i dint know anyone else with a fax. Most of that machines early life was used sending and receiving for others. We have lived in a marvelous age