A smart scientist amd a blonde girl sit down on a plane. A very smart man boards a plane and sits down. A blond girl sits next to him. He is bored so he says to her "Let's play a game, I give you a riddle if you cannot find the answer you pay me 5 dollars. If you answer it though you give me a riddle and I don't answer it I'll give you 300$" She says "OK, I'll go first." "What goes up a hill on 1 leg and goes down on 2?" He thinks about it for a while but after about 10 minutes can't find a answer so he Google's it. Nothing. He calls scientists and several well educated people. They have no clue. He, a man of his word gives the 300 dollars to her. He asks for the answer she shrugs and hands him 5$