Once in a Life time events

What makes something a 'once in a lifetime' thing? All of the motu has had 'snow' from the polar blast sweeping through town & it's sent all into a delightful childlike 'flurry'.  This afternoon, not long after Jakita had left the whare, it started snowing.  Really beautiful silent, soft & serene snow. I had to ring to ensure she was enjoying it & ofcourse she was.  Outside in it with her siblings, helping collect snow for Hami to build an igloo.  What fun, what wonderful memories.  I remember snow in Upper Hutt as a teen.  The family driving to the first sight of a pile of snow.  Our play at the side of the road was short lived when Amelia, who was very cute in her head to toe snow suit, almost disappeared in a pool of mud thinly disguised as snow.  Two chubby snowpant legs completely covered in thick mud & one rather upset 2yo.  Not even time for a snow fight much less a man, but memorable no less.  This blast of snow should be more than memorable for Jakita who only a month ago 'wished it would snow in Petone'.  We were driving to UH on a wet & average winters day when Jakita randomly pondered upon the weather around the world.  "What would the weather be like in India now?"... I rant some explanation she's mostly not listening too.  She responds with "I wish it would snow here".  No sooner had she finished her sentence & looking out the window we see piles of snow (perhaps hail) gathered along the River road.  What the hey?! Is that snow? Nah, can't be... It bloody well is you know.  As far as I'm concerned it was & snow becomes just one more reason for Jakita to believe in God & ofcourse fairies!