this is a new theory that i wanted to research on:

Think Mathematically and answer if you know:

What is the probablity that all candles will extinguish in 1 blow if you are celebrating your 18th b'day with a round cake?

There are 2 possible options i feel:

1. If you are a really big fellow the diameter of your mouth may be big enough to blow air over the enitre surface area of the cake leaving no candle uncovered. Hence all candles may extinguish
2. If you are a small fellow with slim built your mouth may have only enough diameter to blow air in a small imaginary cylindrical shape that might extinguish the candles in the centre of the cake. Around 20% candles may be extinguished by that.