Dean Peterson, a young filmmaker out of New York, frequently used a particular set of subway stairs that always caused him to trip. He decided to investigate and discovered that a less than an inch irregularity on one of the steps was the culprit.
Being the imaginative filmmaker that he is, he decided to see if anyone else was having this problem and chose to make a film about it.
The irregular stair has subsequently been fixed.
Thanks to Dean Peterson… it will always be remembered.