In the 1970s, a German rock group had a one-hit wonder with a protest song against Munich's sex trade licensing (Skandal im Sperrbezirk). In the lyrics, they had a made-up (so they thought) phone number 32-16-8 that fit the meter of their lyrics in German.

Unfortunately, that was a real phone number in many cities, you could dial the short/local number directly without a 0 and the area code back then. Cue prank calls across the country and quite a few scandals since the topic of the song was, after all, the sex trade.