I've had to do it quite a few times.
I screw up the automated part on purpose to get a real live human being. Then I drag it out as long as I possibly can. I'll read in stupid accents, ask her to "hang on a minute" while I find screen again and then sit there for a while, all sorts of fun.
I figure if you're going to waste my time re-registering my legal copy of your software then I'm going to repay the favor by wasting as much of your time as possible.
It's just my passive-aggressive way at getting back at the "man."