On the train to Central, a father and his (approx) 20 year old son were sitting on the right side of me. His son seemed to have some form of an attention disorder/ down syndrome. The son would laugh randomly and slap himself stupid. People on the train did not seem very comfortable in his presence, like every other 'normal' person would feel around a crazy guy screaming in the train all the way back home.

Later on, the son started singing a middle eastern song (judging by their appearance and accent). Causing what would have been an embarassing scene, the father sang along with him.