Rabid.

If one of these things...



... flies in your window, while you're napping and brushes against you, don't just catch it in a towel and throw it out the window. You may assume it hasn't bitten you, but you might be wrong. A 16-year-old boy in Texas just died of rabies.

Here is my own personal bat story. I ended up with a lot of rabies shots, because we could not be sure that the bat I caught and threw out the window was not rabid.