One minute he is happily dancing and minding his own business as the Tube train trundles under the streets of London.The next he has been unceremoniously shoved in the back by a fellow passenger, through the doors and onto the platform as it prepares to pull away. Many have slammed the dancing man's attacker, who flicks a V-sign at his victim after pushing him from the train, while others have commented on how hilarious the episode was.