Never

That concert you didn't attend, and it became a fabled classic
That art you never saw hanging on the museum wall that would have opened your eyes to so much more
The meal you didn't eat at the fancy restaurant that would have been the best you'd ever eaten
That woman you saw on the busy city street only for a moment, but you knew there was instant chemistry there and life with her would be amazing, but you continued on your way, and she kept walking in the other direction
The perfect son or daughter you never had and the love, the laughter, and the heartache they'd provide
The job you didn't apply for that could have changed you life
The first perfect day of spring and you missed the picnic at home in bed with allergies
And worst of all, you read their poems, but never tried to write your own