What happens to a candle when you light it and let it burn?
It melts, doesn't it?
Let's be candles.
Stand up straight and tall.
Here's the wick on top.
Let's light the wick -- POOF!
I'm a little candle growing smaller as you see. (sing on descending scale, slowly sinking down and speaking more and more slowly)
All my wax is melting till there's nothing left of me.
(spoken) Now I'm just a puddle of wax!