Comedian Robin Williams has become the latest star to feature in Tv skits for chocolate treat Snickers. The quirky ads, which launched during the Super Bowl in 2010, feature 20-somethings becoming celebrities like aged Betty White and cranky Joe Pesci on the football field and at parties when they're in need of a chocolate energy boost. In Williams' new American football-themed ad, the funnyman takes on the guise of a coach trying to will his confused team to victory.