Whats Your Favorite OS X Upgrade Superstition?

Russell Beattie has recently jumped on the Apple / OS X bandwagon, but he's never been through a major upgrade of the OS before and ponders aloud on his blog: "What is upgrading a Mac like? I'm about to do it twice, so I hope it's painless as you would expect an Apple upgrade to be,
but I don't know. Is it one of those things where you're better off wiping the drive? Hmmm. I guess we'll see in a bit."

I, personally, ascribe to a rather foolhardy "Damn the torpedoes, full speed ahead!" approach to major upgrades to OS X, but I was wondering what rituals you may go through when upgrading.  Does anybody out there have a set routine or some archane pagan vodoo-ritual that you will go through before installing Tiger?

Discuss.