US President Barack Obama and US First Lady Michelle Obama danced to 'Uptown Funk' in the company of two stormtroopers and R2-D2, at the White House in Washington, D.C. on Wednesday evening. The characters from the Star Wars film franchise were joining the president and his wife to celebrate May 4th, often dubbed 'Star Wars Day', because it is a homonym of the phrase "May the Force be with you." Star Wars fans across the globe take to social media every year on May 4th, in order to share photos, quotes and ideas from the film series.