Fidget Cubes
The Fidget Cube (and other "fidget" toys) went viral in the past few years. These little gadgets are designed for folks with attention disabilities, but anyone can use them and find them enjoyable. They can help someone focus on any task at hand.
Turning Water into Wine
This wine glass is a bit of a stretch, but it does work! Somehow, the canister turns water into wine. The exact science of it hasn't been made public, but the proof is there... Why is this better than just buying a bottle of wine? Who knows!