So what's up with the extra "K" you're asking? True, the correct spelling of paper knapkin is actually paper napkin, but there's a reason for the special K.
In Middle English, the word "knap" had several definitions, but the noun form meant the top or summit of a hill:
Main Entry: knap
Pronunciation: 'nap
Function: noun
Etymology: Middle English
1 chiefly dialect : a crest of a hill : SUMMIT
Crafting a creative idea, or even a thought, can be likened to trying to crest a hill or mountain; some uphill battles, some twists and turns, but the payoff is well worth it.
And many times, that journey can begin on a simple piece of scrap, or even a paper knapkin. So, dive into the melting pot and have a taste, but don't forget to wipe your mouth...
1957: Kellogg's introduces Special K cereal.
1957 - Present: People from around the world crack bad, pun-laden jokes about Special K.