quake in one's boots
to be afraid, to shake from fear
I was quaking in my boots when my boss told me to come to his office.
Most Unbelievable Feats Of Humans
Survival of the highest fall without a parachute
Vesna Vulovic is a Serbian former flight attendant who holds the distinction of being the world record holder for surviving the highest fall without a parachute: 10,160 meters (33,333 ft). Vulovic fell out of a plane that exploded. She suffered multiple fractures, and she was in a coma for 27 days but after that, she fully recovered from her injuries and even continued to fly.