"Surya Bonaly, a French figure skater, landed a backflip on one blade in the 1998 Nagano Olympics. This was banned in 1976 and Bonaly did it despite knowing that it would negatively affect her score. It has not been repeated in the Olympics since."
#45 There may be many of them, but there was one in Madison, WI back in the 80’s.
I've been to the one in Milwaukee. Didn't know there was one in Madison as well.