I was taking a bus on my morning commute to school, and I was beside the exit door by the card reader. The seats by the door had an old uncle, around 70-80 years old, and a Sec 1/2 kid. While preparing to alight, the uncle nudged the student beside him, and told him (in Chinese) that "If you want to throw rubbish, you don't have to get off the bus, just wait for the doors to open and throw it out." When the doors opened, he bent over slightly, and aimed HIS GODDAMNED USED TISSUE PAPER OUT OF THE DOOR. I was getting off the bus, so I walked out, took the tissue, gave him the finger, and walked to the nearest rubbish bin.