We make choices but are constantly foiled by happenstance.
chromosomal dance oh, heavenly happenstance rare creation, you -Marcus (Poetry Spam #22)
It's luck that one thing works out and one doesn't, it's sort of happenstance.
History is not happenstance: it is conspiratorial. Carefully planned and executed by people in power.
The older you get, the more you realise how happenstance... has helped to determine your path through life.
In an infinite Universe anything can happen.
Accidents did not just happen. From time to time they were carefully plotted, calculated, and arranged to one’s advantage-all, of course, under the cloak of happenstance.