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A whole lot of things happen in ones that you pay no attention to. Of the hundreds of thousands of things that happen each day, a few are likely to coincide with others, and s subset of those are likely to further coincide with a subsequent occurrence.
If I flip a coin hundreds of thousands of times a day, there's a 50/50 chance that a two-coin sequence will be either HT or TH. There's a 1/4 chance that it will be HH. There's a 1/8 chance that a HHH series will come up, but if you're looking at HH, the probability of the next flip coming up H is not 1/8, it's 1/2 just like any other coin flip in the series.
Because of the relative rarity of things happening in sets of 3, we assign undue significance to those things that do happen in sets.
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