interesting observation about hatching eggs

Today I made a rather interesting observation about hatching eggs. I bought 2 of the small gift packages in the shop, for the incubators. To clean my inventory from all the 5km eggs, I hatched away. Then I went to a known exegcute spot here in berlin, and to farm exegcutes.
Since I put 5 eggs into the incubators at the same time, they all hatched at the same time. Quite directly next to the exegcute nest. Naturally, the next eggs I found came from the Pokestops around the nest.
Since I found mostly 5km eggs, I did another big round of hatching.

And then, tonight, two more Exegcutes hatched.

This might be completely random. Still, today I hatched 11 eggs, I think and got 2 times a mon i was not able to get even once in all the 80 eggs i hatched before (first time buying any incubators).
And while once might constitute happenstance, to quote Ian Fleming, and twice is coincidence, three times is enemy action.

So is there a third time? Not nearly as clear, but here we go:
I had a 10 km egg I set aside for an incubator. I hatched it today. It was a kabuto, the monster of the fortnight before the current pest of paras'. I remember hatching already one kabuto while it was ubiquitous. And I hatched a paras 2 days ago, which is ubiquitous right now.
On top of that, I hatched 3 water mon tonight (stardiu, seel, tentacool) which would also fit with my farming place today (a park right next to a body of water).
Obviously, these examples are not as striking as the 2 very rare exegcutes. And with some of the examples, my memory might trick me, and i cannot be truly sure when i picked up which egg (except for today, I ran out of eggs while hatching and can thus definetly confirm that the exegcutes-eggs where found today.

In case I did not made my point clear: It seems very likely to me, that your eggs are connected with the place you found them at, and are more likely to hatch a mon that could be caught at that place.