On January 12th, 1896, a group of three college students broke into a physics laboratory and took the first X-ray photograph produced in the US.
It was only six days earlier that German physicist Wilhelm Conrad Röntgen had discovered a new form of radiation: the X-ray ("X" because it was unknown). He was in fact awarded the first Nobel Prize in Physics five years later.
The three students brought a strange assortment of items to photograph: the finger from a cadaver's hand, pins, rings, pills, bullets, and an eggshell with a button in it! Afraid of getting in trouble for trespassing (and bribing the building's janitor!), they kept quiet about their experiment, and eventually realized that they were "making history".