https://www.youtube.com/watch?v=--5NkNPz7uE

This form of Creepy-pasta came from youtuber DarthChikiN. He created this meme out of random and this video has been popular to Left 4 Dead players ever since. It shows survivor 'Coach' looking at the player in a stoic expression, then says "Hankey Pankey" Which is a line snip from the Dark Carnival Mission in L4D2. Then he makes a pedophile-looking face and slangly, says "Mmmmhmm' as satisfaction of something. This video has gotten a laugh out of many people and at most times, players play this video into their microphones.

There have been a few responses, or parodies of this Creepy Pasta.
-Like "Ellis Wants to do things with you"
https://www.youtube.com/watch?v=FbD9Zqek4PE

-Or "Nick wants you to do something"
https://www.youtube.com/watch?v=w6mKUmdBbec

Not Much else can be said about this meme until further details have been known.