Toronto mayor Rob Ford has again been caught on video behaving erratically in public.

In footage CTV said was filmed by a “star-struck” Mississauga teenager around 10:30 p.m. on Saturday night, Ford stumbled, spoke in a garbled manner, and swore while standing on the sidewalk outside city hall wearing a beaded necklace in honour of St. Patrick’s Day.

In the video, a woman who says she is the teen's mother tells the mayor he is “awesome,” and that she would vote for him any time, before he says he needs a taxi. As he prepares to enter a cab, he yells something hard to discern, then adds, in a quieter voice, “You f---n' idiot.” The people around him laugh.

Ford reacted with irritation when a CTV reporter questioned him about the video during the St. Patrick’s Day Parade on Sunday. “Give me a break, guys,” he said. Pressed on whether he had been drinking, he said, “I’m here, right?” He added: “Are you serious? Were you drinking last night? You never drink, right? You guys don’t drink.”

The incident came two years after the self-admittedly “out of control” St. Patrick’s Day during which Ford allegedly attacked aides, referred to a South Asian taxi driver as a “Paki” and mocked his accent, stormed the dance floor of a downtown bar, wandered city hall with a half-empty bottle of brandy, and was alleged to have used powder cocaine and OxyContin. He later denied having ever assaulting a staff member.

Ford promised complete abstinence from drugs and alcohol in the wake of his November admission of crack cocaine use. But after boasting for weeks of his sobriety, he was filmed in January ranting profanely in a Jamaican accent in an Etobicoke restaurant.

After that, he acknowledged he is still consuming alcohol. He has since repeated a new mantra, “I wasn’t elected to be perfect,” and has insisted that his drinking is a personal matter unrelated to his job. He has been steadfast in his insistence that he is not an alcoholic or an addict, and he maintains that his only personal problem is his weight.

This is at least the fifth time Ford has been filmed behaving erratically while serving as mayor. He appeared to be smoking crack cocaine in a video filmed at an alleged crack house about a year ago. In another surreptitiously recorded video, which he has not explained, he rants about his desire to violently murder someone. He admitted he was intoxicated during a 2013 visit to the Taste of the Danforth festival.

Ford was spotted in his city hall office earlier on Saturday evening. He told a CTV reporter that he was there returning phone calls.

The video ends with him entering a taxi.