Remember those "Spoiler Alert" signs that attempted to save straphangers from the terrible fate of knowing when their train was going to show up? Well Kevin Bracken and Jason Eppink, the masterminds behind the prank, sent us this video showing how they did it. And we don't want to worry you or anything, but making an official-looking subway sign looks disturbingly simple. Where are the artists working on FML signs? The subway needs your Internet memes!