I watched an excellent video about The Surprising Secret of Synchronization
There are examples of pendulum clocks or metronomes synchronizing when coupled by a swinging platform. Other examples are flashing fireflies in a tree or an applauding audience in a theatre.
What about electronic crystal oscillators? Do they synchronize when powered by the same power source with a high internal resistance and only a small decoupling capacitor?
I am thinking of crystal oscillators of the same type and the same nominal frequency but with the usual small deviations of some 10 to 100 ppm.
P.s. Of course this is nothing that a circuit designer should do. If several 10 MHz clocks are needed, they should be derived from the same master clock.