Not impossible. Orgasms can be almost instantaneous if there's enough internal tension in the muscles of the pelvic region. This is known to happen to gymnasts and other athletes who experience intense pelvic muscle contractions that stimulate the sex organs without manual manipulation. That being said, this looked fake not because it couldn't happen but because it just wasn't a very convincing orgasm. I want to be real, though. I'd like to think that anywhere, at any time and with enough excitement, girls might spontaneously orgasm around me.