My grandfather was building a deck on his house and had a bunch of lumber piled up for it. I had the genius idea that I could use it to make "roller coaster" tracks down the steep hill behind their house. Then I had my brother climb into our wagon to test it out. He was about 1/3 of the way down the hill when I realized that he was heading for the tree line with no way to stop... so I ended up sprinting after him and flipping the whole thing over.