Barack Obama pays surprise visit to school and students couldn't contain their excitement

Barack Obama has delighted students at a Washington DC school after walking into their classroom unannounced.Pupils at McKinley Tech High school gasped and screamed in excitement at the sight of the former president, who has largely avoided the public eye since leaving office.The visit, video of which was shared on Mr Obama's Instagram account, was part of "supporting the next generation of leaders", a spokesman said.