If you're one of those people who often use disposable plastic spoons, at work or in a favorite bar, collect them instead of leaving them at the table after you've finished your coffee. Plastic spoons can be recycled! You’ll need two or three dozen spoons, and a disposable plastic cup.
One of the suggestions is coming right up:
Extra tip: I'm not sure what to think about that plastic cup and candle flame. The same spoon-method can be used with a glass cup or a jar...Feel free to post a photo of your work!