Selective awareness. If I told someone NOT to look at any red pick-up trucks they encounter, they are going to be even MORE aware of those trucks! (I see my old address in odd places from time to time. )
There are only so many numbers. Some people are more prone to seeing patterns than others. None of these apparent patterns mean anything. When you do the math, things that seem improbable turn out to happen quite often. For example, meeting some acquaintance in a foreign city. Seems unlikely, but if you and your friends travel often, it will happen once every few years.
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