How many of us don't think twice about a height of only 12'? I know that I will often be cautious, but not overly so when I used to jump off greater heights. But it obviously does kill.
http://www.philly.com/philly/news/new_jersey/20150417_Stagehand_killed_in_fall_at_Borgata.html
http://www.philly.com/philly/news/new_jersey/20150417_Stagehand_killed_in_fall_at_Borgata.html