I was in a queue buying coffee to take out today. It was practically full and in front of me was a man by himself buying a sandwich and tea to stay in, and one available table only.
Two women came in behind me, one swanned off and took the only spare table whilst her friend bought the drinks.
Basically they'd pushed in. I think it's extremely rude. I didn't see what happened as I got my takeaway coffee and left. I do hope he challenged them though.