I never get bored coming to Kedai Kopi Kwang Koan, as there is always something new to find out here, such as the upside down coffee serving. It turns out that not only black coffee can be served this way, but also coffee with condensed milk (kopi susu).
However, I was very disappointed at the attitude of the owner one time. I had black coffee that cost IDR 8.000, and I paid with fifty thousand bill. The owner said in an unfriendly tone that it was too early to have change for my bill, and he just ignored me. His staff then asked me if I have a BCA card.