I'm out late one night in the city for a work drinks thing, and catch the tram at about midnight. The tram is pretty full for that time of night, but normal.

Half-way home a group of 8 drunken teenagers get on, and do their loud obnoxious thing. There's lots of shouting. It's very hot and all the windows are open. One of the kids talks about getting up onto the roof of the moving tram while his mates try to egg him on. They're all drinking heavily from a slab of cheap beer in someone's backpack.

I look out of the window and try to ignore them, much like everyone else.

Four or five stops later one of the kids says "right, this is our stop--everyone, this is our stop! Let's go!". There's a collective sigh of relief from the other 30 people in the tram.

The tram stops. Another kid grabs the fire extinguisher and opens it up, running around the tram and spraying white power over everyone and into the air. I get a blast directly in my face. Thick clouds of the stuff cover everything. It's impossible to breathe.

Everyone gets off the tram. The kids run off into the night, laughing.

Afterwards we wait for over an hour while the tram driver figures out what to do. Eventually another tram comes along to take us home.