Imagine you are one of the many incarnations of Spider-Man. Imagine it is the day after you have finished your costume and webshooters. You go up to the roof of a skyscraper in New York, put your costume on, thinking you are going to look over the New York landscape and contemplate all the good you plan on doing, but as soon as you look out...you realize you are afraid of heights. Damn.
I love Spider-Man and all his various forms, but it always gets me how he immediately gets into the web-slinging and skyscraper acrobatics with no hesitation. Cmon.