1. You throw peace signs up for every picture.
2. You visit the convenience store 3 or 4 times a day.
3. You wave your hand in front of your face to indicate a "no" and nod a single time for "yes."
4. You bow when thanking someone over the phone.
5. You buy a present for someone just because they bought you one.
6. You fill your entire suitcase with cheap sweets when you go on a trip to pass out when you return.
7. 60kph in a car feels REALLY fast.
8. You can navigate a city's (especially Tokyo's) subway without freaking out.
9. Sticking 2 or 3 tickets into the machine when getting on a train makes sense.
10. You pass gorgeous temples and shrines everyday and don't look up to enjoy them.
11. You've accepted that binge drinking at least once a week into your 60s is inevitable unless you develop an "allergy" to alcohol.
12. You pronounce Japanese words correctly when speaking English. For example: karaoke, teriyaki, and karate (te, not tee) instead of carry-okee, terri-yeah-kee, and car-ah-tee.