I was walking through immigration and handed them my Taiwan ID card. I hard forgotten that I was supposed to give them my passport and visa instead which caused some confusion. While I got my documents out of my backpack, I explained that I had been in the US for a month and forgot standard procedure. However while my backpack was open, and immigration officer reached in and took out a Japanese dictionary. He seemed to be very fascinated by it and was flipping through the pages of the dictionary.