Kind of difficult to explain but I'll try. Was in middle school walking down between two rows of classrooms. The classrooms are outdoors but there are sections of flat gravel roof spanning above two classroom doors. So as I walk I am under the sky for 25' roughly and then under the roof for 6' roughly in repetition. As I am walking I am also flipping up a quarter with my thumb and catching it in my palm. So I flip up the quarter just as I'm reaching a section of gravel roof, the quarter goes up on the roof and I kid you not a piece of gravel lands in my hand. I still have that piece of gravel worth 25 cents.