First, quirky inventions that are so convenient or useful but when we use them or tell someone about your having used them, they look at you funny. Example: Sauna pants
Second, Celebrity Ads. Perhaps Japanese talent agents just work five times harder than their American counterparts, but if you have a favorite celebrity (Japanese or not) or simply can recognize one (or maybe you’re a Japanophile and know two), then you will see their face(s) smashed onto a dog’s body or holding a bucket of chicken. This will happen to you at the very least, once a week.
Third, if you’re in Japan, or have the opportunity to watch direct-from-Japan ads, do so, jump at the chance, youtube something if you must, just do it. Japanese TV commercials, CM as their called, are the funniest of their genre I have scene, on par with the best Super-Bowl commercials you still remember and talk about (still very upset I couldn’t watch any this year—Japanese don’t like [American] Football). You shouldn’t watch while eating/drinking any hot liquids, we have the TV on during dinner and its very difficult not to snort my Miso soup during commercial breaks. Disclaimer: don’t get your hopes up. I have a strange sense of humor.
Lastly, western people mix so awkwardly with Asians 90% of the time. This is partial due to with the nature of both parties simply being terribly different and usually fairly ignorant about one another. But mostly this is because the western standard of awkward and the Japanese standard of awkward is the same, but neither partly knows how to prevent nor remove the awkward turtle once he has shown his scaly, wrinkly face. Even I, an extremely awkward person who has successfully managed to control the level of awkwardness in most situations, am hopelessly lost in the ways of the Western-Japanese Awkward Turtle…