what passengers need to know

Let’s start with a definition.

speak·er scum (n.) /ˈspēkər skəm/ informal, derogatory (also: universally agreed upon) — A carbon-based life form who plays TikTok videos, sports commentary, or inexplicably loud phone calls through their device speaker at full volume — in an enclosed metal tube containing 200 people who did not buy tickets to their personal entertainment experience….