History of spamming, as read on Wikipedia: It is widely believed the term spam is derived from the 1970 Monty Python SPAM sketch, set in a cafe where nearly every item on the menu includes SPAM luncheon meat. As the waiter recites the SPAM-filled menu, a chorus of Viking patrons drowns out all conversations with a song repeating “SPAM, SPAM, SPAM, SPAM… lovely SPAM, wonderful SPAM”, hence “SPAMming” the dialogue. The excessive amount of SPAM mentioned in the sketch is a reference to British rationing during World War II. SPAM was one of the few meat products that avoided rationing, and hence was widely available.
Although the first known instance of unsolicited commercial e-mail occurred in 1978…

Have also a look at the short movie done by Left Hand Rotation (Spain). They are spamming people in the streets.

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