蜀犬吠日 [ㄕㄨˇ ㄑㄩㄢˇ ㄈㄟˋ ㄖˋ; shu3 quan3 fei4 ri4] lit. Sichuan dogs bark at the sun (idiom); fig. a simpleton will marvel at even the most universal known. alludes to the Sichan foggy weather where it's uncommon to see a sunny day ◄ ►