Ellis: So, this one time, me and my buddy, Keith, we saw these infected Valentine cards on the internet. And Keith was like, "Hey, we could make some money selling those." So he got out his little sister's box of crayons and made a couple. Then, I was like, "Keith, we ain't gonna make no money selling five cards." So he spent a whole year drawing, like, a thousand cards or something. Then we saw new versions of those cards, like, to download the next year and ...

Rochelle: Ellis, sweetie. Not now.

Ellis: Okay.

[Thanks for the tip, Jesse!]

Source - Valve Valentine 2010 [PDF]