There is a filk song by this title that has been around for at least a couple decades, and several SF stories as well, all about the issues that the time dilation of near lightspeed travel will pose for human interactions. These are a long way in our future, but our money is “pushing the speed of light” today:
How Wall Street Got Addicted to Light-Speed Trading
From Slashdot,
From Hilbert Space to Dilbert Space, and beyond 