どんどん！ぽんぽん！！ Can both of these 擬音語 words be used to say "Knock knock"? I mean, sometimes when a person is entering somewhere, say for example in a roommates room, he would say "knock knock" just for fun to mean that he is knocking on the door but actually he is imitating the sound of knocking on the door through his mouth. In Japanese/Japan if a person enters somewhere like that, which one will he/she use? 「どんどん」 or「 ぽんぽん」? An example of this can be seen in this video (if you would like to know what I meant so far!!!): http://www.youtube.com/watch?v=15bj5RPwCYM&feature=youtu.be&t=2m4s *あと一つの質問： 「口コミ」は何ですか。 ありがとうございます。