Death

I remember as a kid going to visit my great grandmother...my grandfather said, 'this might be last time you see her, so make it count' or something to that effect, and it's always stuck with me. I did actually see her a few times after that, but point: made.

Get your affairs in order, make sure your worthless 'stuff' is taken care of, and then cherish the moments you have with the living, for you never know who will go first, you or them.

When you think of death, remember that there's nothing you can do about that, but plenty you can do until then. When I think about death, I try to call someone I haven't talked to in a while. Anyone. Just call, say hi, and relish their life.