Haha, I hate retard conversations at work. All of my direct colleagues are retarded, and the only one with half a brain is big ole' racist. So yeah..that cuts down conversation matrial quite a bit.
I usually just plug in earphones and cut myself off. And get pissed when they talk to me about their day or something. I just...can't muster the attention to listen to their drivel. The older I get, the less time I want to waste on nonsense and idiots.