Not only will this wood-block pistol make you the terror of your next family activity night, it'll actually improve your Jenga game! Through science! For, you see, the faster you can knock a block out of a Jenga tower, the shorter the amount of time over which it can exert a frictional force on its neighbors. Which means the whole kit-and-caboodle is much less likely to come tumbling down.
Want one? You'll have to build it yourself. Which is fitting because the word "jenga" actually means something like "Hey, you, build it!" in Swahili.
Need written plans? Creator Matthias Wandel sells a detailed, step-by-step guide on his website for a reasonable $6.