“Huh?” Is strong candidate, if you accept it is a word. Here is a fun talk in the subject https://youtu.be/rHHJ3hSppEA?feature=shared https://youtu.be/rHHJ3hSpp

“Huh?” Is strong candidate, if you accept it is a word. Here is a fun talk in the subject https://youtu.be/rHHJ3hSppEA?feature=shared https://youtu.be/rHHJ3hSppEA?feature=shared It seems the demands of asking for clarification in conversation shapes the word to be easy and fast to pronounce.