Morning Scepticism: Crop Circles

At the pub last week I was asked about what I thought of crop circles. I gave the stock standard skeptic reply - there's no evidence of alien craft and plenty of evidence of people with boards pushing down crops. Though one interesting story I mentioned was of stoned wallabies, the intent was to show that sometimes there are unusual explanations that are still down to earth. That explanation seemed to be more captivating than the people with boards, probably for the same reason aliens are. Unusual phenomena it seems needs unusual explanations!