In Austin, TX there are millions of bats that live under a bridge downtown. At dusk every night they come flying out. It is quite a spectacle and hundreds of people are there every night to watch. If you are standing under their flight pattern, you get a shower from above. It's pretty gross to think about but they aren't at all scary. There is also a lesser known bridge in Round Rock with thousands of bats. It was easier for me to get to and parking wasn't a problem so I went a couple of times. I guess I'm not afraid of bats unless they are inside a building with me.