Pray for What I Don't Know?

Oddly, I've felt it necessary to pray for something unknown, something highly improbable and not something I can plan for, nor is it particularly easy to pray for it, since I don't know what it is. So, I use Nassim Taleb's term- Black Swan: a large-impact, hard-to-predict, and rare event beyond the realm of normal expectations. And, being human I add the word GOOD in large letters, because Taleb's definition can be either good or bad.