As it turns out, the worst mistake you can make when trying to cut the perfect slice of cake can leave you with a crumbly ...

or birthday cake. It doesn't get stuck in the icing and drag on each piece like a knife would and it's a secret weapon to ...

But, instead, someone hands you a giant knife and you realize with horror that you're expected to cut multiple perfect slices out of your elaborately decorated, awkwardly shaped round cake.

A hand with red nail polish cuts into a pink-frosted cake - Jonathan Knowles/Getty Images ...