Has a potentially life changing thought ever casually come to you?

This morning, in typical but mild regret, I wished that I could turn back time, because if I knew my dad was going to die anyway, I would've pretended to be in agreement with his desires for my life until afterwards, to spare myself the hassling that came with that.

Then I realized how much of my life I still have ahead of me (probably), and thought-

"In the future, this might be the point you want to rewind back to. So what should you be doing differently now?"

It's simple, but it made an impression on me, hopefully a long lasting one.

There are, of course, things I have no way of knowing will happen, but still.