A few weeks ago I had a wasp in my house. I killed the poor bastard and felt bad about it. Then, last week I saw this: That's the light on my front porch with a wasp nest very close to it. It's gone now, and I feel bad about killing the bugs that called it home.
I don't have a picture of it, but I also had to knock down a robin's nest that was built over the motion sensor light on my garage. The leaves or whatever the bird used to build it kept blowing in front of the sensor and turning on the light. I hope it built another nest somewhere safe.