I haven't ever since I saw the videos of the animal abuse that happens involving the chickens.
Here is a game that educates you on the situation as you play.http://www.kentuckyfriedcruelty.com/superchicksisters/index.asp
Here are several videos of celebrities talking about the cruelty. Watch the "Kentucky Fried Cruelty" one by Pamela Anderson. I do warn you though...The contents are very graphic and disturbing.
Some people say that these videos are just isolated incidents so it isn't a big deal. I think differently. I think that if this goes on at all, I refuse to eat KFC until conditions improve. The same goes for Tyson chicken (One of the factories in the video.)
I personally think that you can't have a fair opinion until you have watched the whole video. It's easy to write off what you haven't seen.