美帝餐廳警告排隊唔好講數學?

匹茲堡 – 當地一名數學教授係一間餐廳發現告示,「排隊等食物時唔好講數學。」 At the local deli. What could have happened to make them put up that sign?? pic.twitter.com/7BzPNjFm1L — Anna Haensch (@extremefriday) June 14, 2017 數學教授將圖片貼上twitter,唔好人都瘋狂猜測點解會搞成咁。 合眾社