Designs which "mysteriously" appear overnight in fields of standing grain crops. Fringe theories have unseen forces of nature creating them, others believe in UFOs' involvement. Prevailing current sane theory says that pranksters create them using a flat board slung from rope which they step on, pushing it forward to lay the stalks down without breaking them.
There's tons of stuff on the 'Net about these...
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"To those of you who are wearing ties, I think my dad would appreciate it if you took them off." - Robert Moog
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