Skimming down a dictionary on the 'hay' page earlier - past haycock, hayloft and hayrick, I wondered how haywire got its modern meaning (wild, erratic). The original meaning of haywire was wire that was used for binding bales of hay. The OED says that in the early 20th century the definition " Poorly equipped, roughly contrived, inefficient" came about as a result of haywire being used for makeshift repairs. A haywire outfit was originally "a contemptuous term for loggers with poor logging equipment" (OED), but then the meaning broadened to mean any inefficient workplace. Go haywire, meaning go wrong, was first attested in the late 1920s. The OED says it originated in the US.