Some are calling it the best moment at the Olympics so far, London mayor Boris Johnson stuck on a zip wire.

Crowds who gathered at a London park to watch the games on live screens and enjoy a fun fair were delighted Wednesday when the mayor provided a comic sideshow.

Johnson was trying out a zip line that was 45 meters (148 feet) high and 320 meters (1,050 feet) long at east London's Victoria Park.

The portly mayor lost momentum about three quarters of the way across, leaving him dangling from his harness about 10 meters (33 feet) above ground for a few minutes.

The crowds, happily taking photos with their cameras, responded with loud laughter. Photographs of the mayor, dressed in a dark suit, a blue helmet and clutching two Union Jack flags while dangling on the wire with his socks showing, quickly spread on online social media networks like Twitter.

Staff at the park eventually pulled him to safety with a rope.

More Olympic video

Special coverage: 2012 London Olympic Games

Source: AP

Editor: Huan CAO

Voiceover: Chris Clark

Producer: Flora Yue