Nikola Tesla. Nikola was insanely obsessive compulsive. He would not touch anything that had the slightest sign of dirt, nor would he touch anything that was round. He was also apparently obsessed with the number 3. He only would stay in hotel rooms divisible by 3, he would walk 3 times around the block before entering a building, and he always ate his meals with 3 sets of 6 napkins.