Recreational use of laughing gas banned in the UK"Three for a tenner," a man sings outside a south London nightclub. He's not selling anything but he's mimicking sellers of nitrous oxide balloons.
Source: Recreational use of laughing gas banned in the UK (https://news.sky.com/story/nitrous-oxide-recreational-use-of-laughing-gas-banned-in-the-uk-13003064)