One sandwich short of a picnic 脑子少根筋
Halloween marks the end of the Celtic year and was believed to be the day when the spirits of those who died in the previous year would come back and possess a body of the living to allow them passage into the afterlife. To frighten them and avoid becoming possessed, the living would dress up in scary costumes.
短语 one sandwich short of a picnic 虽然字面上说的是三明治和野餐，但实际含义是幽默地指某人脑子里少了根筋，做的事情让常人不能理解。
John is one sandwich short of a picnic. He gave up a job in a big bank to live in a caravan.
When we arrived at our hotel by the beach in Miami, all Mary had in her suitcase was her fur coat. She is one sandwich short of a picnic.
另一个短语 to be the meat in the sandwich 三明治中间夹的那块肉，这就是说这个人夹在两方争论的中间， 帮哪方都不好。
My brother and my sister are fighting over who gets our late mother's cat. I'm the meat in the sandwich, as usual, stuck in the middle.