Balotelli is so stupid. I don't think it was a second yellow really but come on, at least show the referee that you didn't mean it and help the guy up or something.
Just his demeanor after every foul makes the ref think that he just killed someone. You know you're on a yellow, as soon as you foul someone you should be helping them up and calming the ref.
He just hits people and struts away like he meant to do whatever he just did.