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Yesterday I was at a pretty unique Halloween party that at the same time was a birthday party for 5 grown-up kids of my "friend" and well at first everything was very nice and we had fun but as the party progressed unto late night I started to notice something interesting that I cannot understand because I don't have any siblings...there were 5 people having a birthday and all 5 of them invited their friends and what was so striking is the fact that none of this people talked to the others ( one group of friends did not talk at all with friends of another person)... I know that the siblings have sometimes tense times but all these people did not know each other at all and it felt like there were invisible walls separating them all... it started to get really uncomfortable for me because I'm not friends with any of these birthday kids so I was sitting in my little corner getting completely ignored even when I spoke to somebody I have never met something like that. But it was also my first time in my life attending a party..maybe it's just me ? I don't know.