Here's something I got in my email inbox:
Now, if you want some valuable information maybe you should read this. At three minutes and four seconds after 2 AM on the 6th of May this year, the time and date will be02:03:04 05/06/07.This will never happen again IN MY LIFETIME, nor in YOURS.Just thought you should know this!
Fair enough. But to this the "deep thinker" in me replies:
Look at your watch. It is now 09:57:12 04/30/07 (or whatever the case may be for you). This moment, too, only happens once in your lifetime. Take a breath. This breat only happens once in your lifetime. Have a conversation. This conversation will only happen once in a lifetime. Kiss someone. This kiss... might get you arrested. This arrest will only happen once in a lifetime.
I think you get the point. How to "live" this knowledge is a different matter altogether.