Ran across this on YouTube. It was a promotion by Jay Reynolds of his late night program on then Musicradio 77 WABC used as part of the sign-off sequence from channel 7 sometime in the early 1970's. This was akin to WNBC, WNEW, WOR, WPIX or WNYC hyping their then co-owned radio outlets.
http://www.youtube.com/watch?v=JIGesIsUhy4
http://www.youtube.com/watch?v=JIGesIsUhy4