I was in a crawl space once and was really freaked out by what I thought was a HUGE racoon. I hemmed and hawed about what to do and decided I need to catch it if I was going to finish the job. So I took a garbage can and duct taped a piece of pipe onto it as a handle. Well, anticlimaticlly, it turned out to be a chipmunk and I think it scurried out the way it came in. But my heart was pumping anyway, and I really didn't like being down there wondering what else was there.