What sorts of cool things can you do with perfectly synchronized clocks? The one that springs to mind might be catching a bullet or “catching” a light pulse, p

What sorts of cool things can you do with perfectly synchronized clocks? The one that springs to mind might be catching a bullet or “catching” a light pulse, perhaps? Triangulating lightning strikes, or other EM events? Maybe some kind of TEMPEST hackery? I’d love to have a highly precise clock but I’d also like to be able to do something with it!