Searching?

Posts like these bug me when I see them, so I promise I'll delete this once I get an answer!

I've searched the memories, and past four months in the calendar, but I cannot find what I'm looking for.

I remember a tutorial that was posted before, featuring Jake Gyllenhaal, a tutorial about greyscaling the whole image, and leaving one object colored? I know there are other tutorials on how to do it in the mems, but I'm looking for this specific one. If anybody could show me the link, that'd be great. Thanks. ♥