Falling is one of humans' deepest, most primordial fears. And it's a worthy thing to be afraid of, given that the impact from any fall of significant height is likely to cause serious injuries and could even lead to death. This reality is likely the reason why people are so scared of heights, yet it's actually possible to live through even the most traumatic falls – as people who have fallen off of buildings but lived to tell the tale prove.
There are all types of situations whereby someone might accidentally plummet from a great height. They could fall from the side of a cruise ship in rough seas or have their parachute fail to open during a skydive. Whatever the case, it's perfectly clear that falling from anything high would be a truly terrifying ordeal. Just take heart from the fact that such incidents do not always equal death.