You had to be there

Here's a poem I thought up while swimming, thought I'd share.

The other week, when it started to snow
Something hilarious happened
Now, how did it go?
Ah, yes, you see it all transpired
As I was walking the street and a car backfired
The sudden noise caused me to look up and stop
Just as a man came hurtling out of a shop
It turned out the man was a desperate armed robber
And he was hotly pursued by a vigilant copper
The chase, it seemed should have been but a trice
But the policeman happened upon a stray patch of ice
He flipped right over and banged his head
And when I rushed over to help, he was certainly dead
And that's the whole story
But you're starting to stare
So I'll smile and just say
"You had to be there"