Calling Old Numbers In Ads [telecom]

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Reading the original letter (or press-release, I can't tell) of Julia-Louis Dreyfus joining the cast of Seinfeld[1] got me thinking, does anyone have any interesting stories of calling old phone numbers that are still working, that were featured in ads or other documents, especially pre-internet? (besides the ones that are now "chat lines", which probably comprises 95% of them). This is something that I do anytime I come across old numbers in the ads in Network World magazine on books.google.com, but unfortunately, I don't have any interesting stories to tell.

I called the number below, and it's not working, but it does have a generic greeting that mentions the building's main number, and another number for NBC telemundo.