I met an elderly gentleman today from my building at the elevator. I bowed my head and said 'kombanwa' (evening time greeting here). I gestured to him to enter first when the elevator doors opened and said 'dozo' (you please). When he left the elevator at the floor below mine, both of us chimed together and said 'o-sakini' (sort of I am leaving before you).
Unremarkable as it seem, this whole 2 minute incident left me with a big grin on my face. It's always the little things, I tell you.