Andrew Castle is Leading Britain's Conversation.
11 August 2017, 10:46
A man saw a car swerving across the motorway - and discovered it was because the driver was inhaling laughing gas at the wheel.
The footage, uploaded to social media, was filmed in the UK and shows a car driving erratically on a motorway.
The driver, filming the incident with a dashcam, pulls alongside the car to find out why and was shocked to see the man at the wheel inhaling nitrous oxide from a balloon.
"Mental, what the hell, look at them. They're all over the place," the passenger said.
Nitrous oxide, often referred to as laughing gas, is a popular party drug, particularly at festivals.
The colourless gas gives the user a short-lived high, with users claiming it gives them the feeling of floating.
According to Talk To Frank, immediate side effects can include dizziness, difficulty in thinking straight, distortions, headaches and even hallucinations.