Homemade Jet Bob Bishop built the world's smallest jet. Believe it or not, it weights 432 lbs and flies at over 300 mph! Quad Walker Roberto Ramirez was born in the Dominican Republic and as he grew the bones in his legs started to bend forward at a ninety degree angle causing him to have to walk like a horse. He was left walking on all fours! Believe it or not doctors were able to operate and today Roberto walks upright. Scuba Diving Dog When Dwane Folsom goes scuba diving, his dog Shadow goes with him -- wearing his own doggy scuba gear! Well Racing Believe it or not, these daredevils drive motorcycles and even a car around the inside walls of a two-story high wooden well.