This is the first known "Carbine Clue" posted on Twitter by Steve (@LivingWorlds) Williams. If you look at the top of the t-shirts it says "National Vindball League". So, what on earth is Vindball........ some kind of mini-game sport? We'd loved to hear what our community thinks about these mysterious National Vindball League t-shirts. So put on your thinking caps and drop a comment below!