Tomo-Taro taught me some useful expressions... They are a bit funny... He told me to say this to someone who says something rude... "口の利き方に気をつけろ。またぶっ飛ばすぞ。" He said that this is what he thinks about most girls... "俺は男に媚び諂ってる女見ると腹が立つ。あいつらウザイ。" Finally, he said to say this out loud in front of Japanese couples who are doing too much in public... "あのカップル俺たちがそこに居てもいつもいちゃついてるよな。常識が無い。" I think he has a very weird sense of humor.