In some deeply weird alternative universe, perhaps one in which Japanese people actually bought Microsoft consoles and England's footballers weren't quite so irredeemably rubbish, we might never have experienced Super Mario Bros. as we know it. Instead, we could have been playing Super Mario Sisters.
Alas, Nintendo of America never did follow through on a trademark application it filed in February, 1990 for a game called "SUPER MARIO SISTERS." The application was abandoned almost two years later, depriving us all of an estrogen-fuelled version of the world's favorite platformer.
Go past the break for a grab of the application.