The Legos are not pleased. Lego faces, once a happy bunch of working citizens, have been getting angrier, according to a new study. In studying 3,655 figures between 1975 and 2010, researchers found the number of negative faces has increased, while the amount of happy, smiling Legos has been decreasing since the 1990s. "We cannot help but wonder how the move from only positive faces to an increasing number of negative faces impacts on how children play," said researcher Christoph Bartneck. Now this explains those angry millennials.