Who would you guess out of the whole world, would have a one-of-a-kind Minecraft-themed "Top Notch" hat. Well, you'd be right if you guessed Minecraft creator himself, Markus "Notch" Persson, who was invited to play in Team Fortress 2's third Mixup event.
He played on RED, where he was teamed up with Valve's Jon Lippincott and Cobalt's Daniel Brynolf. They versed BLU which consisted of comprising film maker Freddy Wong, Valve's Robin Walker, and others. Notch took home the "Primeval Warrior" medal in one of the games, and Walker also presented him with the "Top Notch" hat.
The "Top Notch" hat is a cardboard box that resemble's Notch's avatar in the visual style of Minecraft. It's equippable by all classes, but because of its size, "it significantly clips with items that exist in the whole head, necklace, glasses, ears, face and beard equip regions". Right now, Notch is the only one who possesses the "Top Notch", with its description pretty cool also:
"Welcome to a secret society so exclusive it makes the Illuminati look like a Costco. How exclusive? You are the only member. This is the only item of its kind in all of existence. So don't craft it, Miney."