So I was in Co-op this afternoon with dd in the buggy. It was really quiet and there were 3 tills open, no queues. I was having a nice chat with the cashier and getting £20 cash back, £10 of which I asked for in change so it took a bit longer. The adjacent till was empty with the cashier sat twiddling her thumbs.
Anyway, as I was getting my cash back I realised that the woman who had mysteriously chosen to join the same till line, despite the empty till adjacent, was massively rolling her eyes and tutting.
I caught her eye and gave a slight 
look, and then she started:
Her: "What the fuck are you looking at, you stupid bitch."
Me: "I'm getting cash back. What's your problem? "
Her: "You're holding up the whole queue you stupid fucking bitch. If you want change you should go to a fucking bank."
Me: "You're the only person waiting and there's an empty till right there."
And so it went on. She rolled her eyes at dd too. Fuck. You. Bitch.
As I left (after putting my purse in my bag as slooooowly as possible) I felt I had to tell her that she was an ignorant bitch. She called out "No, I called YOU a fucking bitch!"
WTAF?!?!