Pray to God to let you die before you hit the bottom.
Are you speaking figuratively, or literally? Figuratively, in the broader sense, as in losing control of ones self: Regroup. Take some time to collect ones self, make new goals, and plan how to achieve them. If you mean literally, I'd ask how high is the cliff? What's at the bottom, water, sand, rocks; lions, tigers, or bears (oh my)? Go feet first, bend slightly at the knees, protect your head, assume you will shatter both legs, but greatly increase your odds of survival, now about those wolves...
So my climbing partner can brase.
Close your eyes and wait for the freedom!
Wake up usually.
make that sound from the chuck jones roadrunner cartoons
who's cliff and why are you falling off him
if I am falling I might as will try to fly I have nothing to lose.
Roadrunner that stuff right back on the cliff
Land with a splat
prepare for death