Of course,Joel.  That reminds me of two other rules I've learned:

The 50-90 rule:  if there are two ways of doing something and you're not sure which is right, you have a 50% chance of getting it right the first time...and a 90% chance of getting it wrong.  It is amazingly accurate for me.

The boat list rule:  if you have 10 things to do, and you do 7 of them, there are only 8 on the list.