This isn't really something I often wonder, but I've been thinking about it a ton tonight. I was in a car with some friends, and 10 minutes after they dropped me off at my house, they got cut off by a drunk driver and their car flipped. Now, they're all mostly okay, it was mostly just cuts and one got a concussion, but it made me think about how quick everything can end.
We spend years going through school, working, saving for retirement, etc, all this stuff partially to help for the future, but in an instant all of the work you've done, all the things you've thought about, all the effort you've put into everything can be ended without any prior warning. Just seems kinda crazy to me.