A blonde lady on a train is looking at her phone. She starts laughing. Maybe she read a joke. Before long, what sounds like one or two other people join her in laughter. Who knows why they joined her – maybe they knew her – maybe they didn’t. But you have a couple of people laughing now.
The laughter subsides, and then increases. This time, the passenger with the coloured hair reading her book looks up smiling. So does the man sitting next to her. And a couple of passengers further down by the door.
By now, it sounds like more passengers have joined in.
It gets louder. The woman on the left (closest to the camera) seems to be losing it!
A passenger gets on, looks at them laughing and moves away. Unfortunately, he can’t escape because a lady close to him starts laughing out loud. The laughter bug has spread! More people are infected! More people losing control!
The woman close to the camera now looks like she’s about to burst an artery – like butterflies will spill out of her any minute now.
And for the passengers who still aren’t laughing (despite all the ticklish commotion), maybe they’re laughing on the inside!
What an unusual happy incident.