OK, now all you doubters, I've got proof (just as soon as I find my camera). I took the general advice here and just ignored the UFO. It sat on my lawn in the back yard for a couple days, about ten feet from the timber patio deck. I didn't bother it, and it didn't bother me.
Then, about last Friday, i got curious and just had to flip it over with a rake. I didn't want to put my toes under it, and it's a good thing I did it that way. Right where it had been resting was a perfect circle of yellow grass. I expect that the hyper-magnetic death rays coming out of the bottom killed the grass.
The really strange thing was, the whole UFO was empty inside, just the top shell left. I'm thinking it was sort of like that helicopter the Seals left in Packistan and the little aliens took all the good stuff away in another saucer.
piper