I hope that in the future they invent a small golden light that follows you everywhere and when something is about to end, it shines brightly so you know it's about to end.
And if you're never going to see someone again, it'll shine brightly and both of you can be polite and say, "It was nice to have you in my life while I did, good luck with everything that happens after now."
And maybe if you're never going to eat at the same restaurant again, it'll shine and you can order everything off the menu you've never tried. Maybe, if someone's about to buy your car, the light will shine and you can take it for one last spin. Maybe, if you're with a group of friends who'll never be together again, all your lights will shine at the same time and you'll know, and then you can hold each other and whisper, "This was so good. Oh my God, this was so good."