Rare Earth Magnets
Comparing regular magnets to Rare Earth Magnets is like comparing a votive candle to a homecoming bonfire. These suckers are powerful. A single one exerts twenty pounds of force; put two of them together and you'll be hard pressed to get them apart again without the aid of some sort of prying tool. They're so strong, you shouldn't give them to children, because the little tykes might swallow one and get stuck to the refrigerator for the rest of their lives. Now that's cool. $6.99 USD.