Can Someone Explain These Crop Circles?

This isn't a scene from the movie "Signs."

This is actual footage of giant "crop circles" that appeared on a farm near the central California coast.

So, naturally this has people wondering - is this the work of aliens... Or some very talented pranksters?

Two friends driving on a nearby road sunday night witnessed strange bursts of green light flashing on the horizon.

They videotaped it and posted it on YouTube where it went viral, bringing a number of curious onlookers to the scene on Monday to see it for themselves.

See full story from CNN affiliate KSBW