Today I sat down at a sofa (2 2-seater sofas) in a busy city coffee shop enjoying my coffee and waiting for DP and DC. A woman with a baby came up to me and asked whether the second sofa was free and I said no since I was waiting - fine. The people on the next sofa just left so she took that seat, when within the next 5 minutes another 3 women with 2 babies arrived!
Had I been by myself I would have offered the sofa and I would have been happy for 2 more people to share my table, but share 2 2-seater sofas with 4 adults and 2 babies? I would have been very annoyed and probably left to find somewhere else to sit. That would have been so rude of them!
Luckily it didn't come to that, but it might have.