半瓶水響叮噹 [ㄅㄢˋ ㄆㄧㄥˊ ㄕㄨㄟˇ ㄒㄧㄤˇ ㄉㄧㄥ ㄉㄤ; ban4 ping2 shui3 xiang3 ding1 dang1]
 lit. if you tap a half-empty bottle it makes a sound (idiom)
 fig. empty vessels make the most noise
 one who has a little knowledge likes to show off, but one who is truly knowledgeable is modest

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