- people who talk at the top of their voices on their cellphones on the train
- people who talk to each other at the top of their voices on the train
- people who play music on their personal devices at maximum volume on the bus
- people who have a formal encounter with you and find it acceptable to suddenly fish out their water bottle for a swig
- gentlemen who run to risque in their taste for jokes and conversation
quite clearly the common theme is human.