All friends are precious, but some friends make you feel like you've found a part of yourself that you never knew was missing before. They're the ones that'll always perk you up when you see them coming (even if they've only been gone a few minutes), the ones you'd gladly spend your last clam on, the ones you'll always share the biggest piece of mackerel with, the ones who know your whiskery secrets even better than you do. That's a best friend.