During the '80s, I once heard a station start off a music sweep with its peppy jingle. Instead of hearing a song after the station's sung call letters, however, there was a prerecorded woman's voice saying, "Ow!" Then, there were several seconds of silence, followed by a song.
After a few seconds, I pieced together what happened. Instead of starting a song, the DJ accidentally segued the jingle with the beginning of an aspirin commercial. The woman's "Ow!" was supposed to indicate the pain of a headache.
I would have been impressed if the DJ had salvaged the situation by saying, "Contrary to what you just heard, playing the hits is never painful on (station's call letters...)"