Moment: a unit of time
Equal to ninety seconds
I bet you did not know this
If you are not too lazy
You may wish to calculate
How many such strange units
You have had so far in life
You must just remember this:
That some are not worth counting
And some you have to count twice

Tanja Bulovic

http://www.poemhunter.com/poem/moments-in-time-12/