Life is a nightmare the more dreadful because of how it ends. There's the nightmare and there's the moments of oblivion. You're alone. No matter who you're with you're alone, you'll live alone, and you'll die alone. You share and relate with your fellow human not significantly more than with a gorilla in a zoo. They'll abandon you. You'll abandon them. It won't be rational or pretty. They'll die. You'll die. You'll physically suffer before you die.

You'll die in agony with a cancer, unless you die of a heart condition first. Chances are you'll make it to the ER and survive your first one. Meaning you'll live to enjoy the defibrillator, the needles, the hospital bed, after which you might have to carry on partially paralyzed and brain-damaged for a while, occasionally soiling yourself. If you have surviving relatives, you'll have to make them suffer watching you. Until you're finally released.

It doesn't matter how much you know the person standing next to you, or how much experience you think you share with them. You're strangers. You're two mute animals who run into each other at a water well, stranded on the same island.

@nobody OTOH the fact that we die, makes us alive too.