I think you might be thinking about McKayla Maroney--she's our American gymnast who was supposed to win gold on the vault in the event finals and then she fell on her second vault. She was very angry and disappointed in herself and her expression reflected that.

But at least she has a good sense of humor. There is a tumblir called "McKayla is not impressed" and it makes fun of her facial expression during the medal ceremony--here is the link: http://mckaylaisnotimpressed.tumblr.com/

And Mckayla retweets the pics she thinks are funny--I think that's pretty cool :)