Well, admittedly, it’s not too big a twist.
Essentially, the girl realises that she is not alone, and the discovery that she isn’t is hilarious.
The video was shared by Adam (@AdamBroud) of his friend Stevie.
It sees the young woman gleefully record herself while making the most out of her empty train – as you do – by loudly singing a song she made up about being on the train alone.
The tweet has 95k likes and has been shared 25k times.
Please enjoy this fantastic video of my friend Stevie. It's one of my favorite things ever pic.twitter.com/gTDaioUtOR
— Abam (@AdamBroud) March 12, 2018