There's a woman at my barn like this, except she knows alot about alot of things. She can go on for hours. Mainly I just nod my head, agree when agreement is needed, or acknowledgmet of the conversation. But I don't encourage her unless I feel like talking. Eventually she stops and we go our seperate ways. Though I have to say I enjoy talking with friends while I'm tacking my horse up. Just don't open yourself for conversation. But be nice, you don't want to come across as the butthole of the barn. It's good to be friendly with people. People will help you then, if not their buttholes in return.