[TaraP]

[Parley Baer]

Hmmmmm, probably someone tracing Obama’s roots.

[Islander7]

It's the Celts!

[Abin Sur]

Rather easily explained, without needing to resort to absurdities such as UFOs.

http://www.skepdic.com/cropcirc.html

[VanDeKoik]

So Aliens, with the ability to fly all the way here, find nothing better to do than ruin perfectly good crops with Spirograph graffiti?

Hey, ET?? We cant read this! Try harder!

[Doogle]

[Dunstan McShane]

How come it's always aliens who are held responsible for stuff like this?

Why not cereal dwarfs or rice elves? Satyrs with a fixation for staple grains? Ghosts who played with Spirographs when they were little mortal children? Leprechauns with way too much time on their hands?

Wait--I get it: it's because dwarfs, satyrs, elves, ghosts and leprechauns are all mythological, whereas aliens are scientific!

[Moltke]

Meh. Alien pikers. There are crop circles, and then there are COKE crop circles:

Cocaine-addled driver destroys entire cornfield on run from police

[mountainlion]

Swamp gas