A friend of mine asked me to sign her copy of Wastelands, to which of course I said sure. However, I qualified my answer thusly:

I’ll even try to think of something witty. No promises there though. More likely I’ll stare at the page for several minutes and then write something lame.  
 

That’s been my experience so far with signing copies. For all you authors out there, how do you go about it? What do you write inside as an inscription?