So, what are they?
To some people, the circles which began appearing about a
decade ago represent the handiwork of extraterrestrial
invaders or crafty tradesmen bent on mischief after an evening
at the pub, or even hordes of graduate students driven by
mad professors. To others, the circles suggest the action of
microwave generated ball lightening, numerous whirlwinds or
some other peculiar atmospheric phenomena.
Then there's Doug and Dave's claim that two old geezers after a few beers at the pub go and stomp down a half acre of wheat.