No talking during a cutscene.
This rule most applies to mothers around the world who seem to always ask questions about school and homework during cutscenes. Cutscenes don’t happen often in most games, and savoring them when they occur demands a code of silence that everyone should understand. If you happen upon a fellow player about to reach a dialogue-rich story section, don’t ruin the ambiance for anything less than a fire. (via GamesRadar)