Trying to defy the laws of physics

Well, yesterday I made a little sort-of hover craft thing. It was a piece of printer on top of part of a headphone. It had a wheel in the front too. I tried to make it move with a sail. There was a fan that was covered by a piece of paper or “sail”. What I didn’t know was when I turned the fan on the air was pushing the sail forwards but it was also pushing the fan backwards. There for it couldn’t move and I was trying to defy the laws of physics.