Today is National Puzzle Day, and what better way to celebrate than by honoring all of the missing puzzle pieces that we’ve found in our lives. No, we’re not talking about those evil lost pieces that leave annoying little holes in the middle of that thousand piece unicorn puzzle. We mean our friends! If you have a BFF (or two) let them know that they complete you, with a fun secret share that strengthens the bonds of your friendship. Because we all know that best friends and belly button piercings go together like a PB and J. (I know, right?)