In a game between FC Baar and FC Sempach, two youth clubs in Sweden, Baar's Joonas Jokinen debuted the back-flip penalty kick. We're quite certain this has never been done in a game before. A few places have referred to this as a "somersault" kick; we'll give young Joonas the credit he deserves.
Note: We initially confused our Swisses and our Swedish. Our apologies. We love both of their candies.