The most time I've spent in Japan was when I studied abroad. When you study abroad in Japan, it's like you're living there. Once you're in a place for so long you start to pick up habits from the lifestyle. Now, if you weren't a big fan of the lifestyle you'll probably go home being your old self. If you enjoyed and respected the lifestyle, like I did, you'll go back home with the habits you've learned while living in Japan.
So without further ado, here are some habits I picked up in Japan!