Along with the candles and the sparkler I like to decorate birthday cakes with a thick layer of loose chocolate shavings ---- which of course fly all over the place and make a big mess when the candles are blown out.
Luckily there is no shortage of people willing to scoop up their fair share of the "mess" ---
--- and gobble up the bounty. It's all part of the birthday party fun.
Sometimes a long standing tradition starts out unintentionally.