You may not know it, but a lump of sugar is non-inflammable – it just won’t burn with a flame. So when your friends see you set a lump of sugar blazing merrily, they’ll wonder how you do it. And when they try to burn a lump of sugar – well, they’ll find it completely impossible!

Secretly dip a corner of the sugar in the
ash and put a match to that corner. It will blaze away and splutter merrily!