If you suddenly move really close towards someone, either a person you know or a stranger, this person will draw back immediately. Without a reason you came into their personal space.
If you have something to show, for example you want to share a message on a cell phone. The person will most likely move really close towards you in order to read the message you want to share. Suddenly the “personal space” thing is forgotten and the situation will not be weird and bizarre at all.
This is so common knowledge and happing on a daily basis. We take situations like that for granted or actually don’t even play attention to it at all.
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