“Sigourney Weaver made the behind-the-back half-court basketball shot successfully…She sunk the shot on the very first take, even though she was six feet further past the three-point line…Weaver described the miracle shot as “one of the best moments in her life”, after her wedding day and the birth of her daughter, of course.”
I think they didn't want some copyright infringement. It's art, just sit back & enjoy it! Don't analyze it or use logic to try to understand it. Personally, I like it. I'm not even thinking at all in "realistic" terms. I like it because it's different & it's making a powerful statement.
"A few days before the opening ceremony police started cracking down heavily on street artists, even making several arrests. They vowed to remove any graffiti they found, but that didn’t stop Banksy and a few other from having their see."
Banksy And Other Street Artists Take On The London 2012 Olympics | Pink is the New Blog