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Fortunately there's an easy way to invert trick spoons. Hold the spoon at least 300mm above your soup and drop it in the bowl. When you pick it up again, there's a 50% chance the force of impact will have inverted the convex side back to concave!

I just turn the bowl upside down if this happens

The old trick spoon gag. Classic

This one is how I learned the word “concave” as a kid