Barack Obama shakes hands with a man in a horse mask

U.S. President Barack Obama greets a man wearing a horse mask during a walkabout in Denver. Credit: Reuters

A walkabout in Denver took a turn for the surreal when the President of the United States shook hands with a man in a horse's head mask.

Barack Obama was caught by photographers smiling and shaking hands with the joker on the unscheduled meet-and-greet around the American city yesterday.

'You'll have to excuse me, Mr President, I'm a little horse today' Credit: Reuters

Mr Obama - and his Secret Service bodyguards - seemed unphased by the encounter and he continued on his route.

The reason as to why an apparent grown man decided to meet the President in a horse's head mask remain unclear.