Answer: Monty Python
When you complain about the spam that exceeds your mailbox or your favorite discussion, you owe it Monty Python to introduce the idea of spam as unwanted material through its comic genius.
In 1970, the members of the British comedy squad created a short sketch called "Spam" where a man and a wife in an oily spoon-style diner are trying to order breakfast. The only obstacle is that everything on the menu contains the reconstituted meat mixture Spam, much to the wife's disgust. A whole three and a half minute sketch revolves around the menu's absurdity and everyone's distrust that wife does not want Spam.
Years later, the widespread love of Monty Python led by computer hobbyists to early emails and Usenet adopters are calling for flooding of unwanted messages and querying spam items on the digital menu that no one wanted, but were difficult to avoid.
Hormel, the company behind the product Spam, has never been particularly pleased with the relationship between their product and email that people hate to get, they have a very cheerier relationship with Monty Python sketch itself. The sketch is part of the company's Spam Museum in Austin, Minnesota and they have released memorials for various Monty Python related events such as Spamalot musical.