[jevgeni]

More wild speculations: could it be, that these quasars are somehow connected through some yet unknown medium, that allows such behaviour? I mean it's difficult to sync clocks on several computers in the same building, how the hell could massive, hulking rotating blobs of pure gravity billions of light years apart "sync"?

[graycat]

Because in some rough sense, at one time all the blobs, filaments, etc. were close together and, there, got coordinated.

[jevgeni]

Those sneaky assholes...

[raverbashing]

The Moon is in sync with the Earth. By the mechanism of Tidal locking.

So, there might be some possibilities.