Swamp Gas!!!

"Must be those strangers that colme every night
Those saucer-shaped lights
Put people up-tight
Little green footsteps that glow in the dark
I hope they get home all right!"
— The Byrds "Hey Mr. Spaceman"

From MSNBC.com:

PORTLAND, Ore. - A fireball streaked through the night sky across the western half of the Pacific Northwest on Saturday, startling people all the way from southern Oregon to the Seattle area.

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Scientists said the fireball was probably a meteor, and that it likely disintegrated just before any fragments fell into the Pacific Ocean.

Summer Jensen of Portland said she was sitting in her living room with her father when she saw the flash of light outside and rushed to see what it was.

"It was like a big ball of fire," and "behind it was a trail of blue," she said.

I hope they get home all right!