Likewise any time you think about something from the past, it could be the last time you ever think of it.

i try very hard to not have experiences for this very reason!

And travel greatly increases this probability

At any moment you could have a moment that you think about for the rest of your life moments

Whenever you see someone, it could be the last time you see ^them in your life.

At any moment you could have the last moment of your life