"While on this topic, don't block the entire sidewalk by walking side by side with your family. Walk in a line instead, and on the right hand side.” -- Dean, USA
Don't even try to explain your "football"
“Please don't lecture us regarding the virtues of ‘football.’ Yeah, we get it. It's unfortunate that both sports share a name but that isn't going to make us enjoy watching the Dallas Cowboys get beat any less.” -- Ted, USA
“Don't talk about how superior soccer is to American football. You'll most likely just be looked at with contempt and pity.” -- Jay, USA
“Don't show the weird face when Americans go overboard about hockey, baseball, basketball or the Super Bowl. Even the most open-minded professor I know turns into a hardcore Patriots fan when cornered.” -- Nguyen, Vietnam
Terrorism isn't funny
“Don't joke about terrorism. This is a rule for obvious reasons." -- Brigitte, Greenland
“Never make jokes about bombs, guns, or terrorist attacks in front of strangers. Americans are very literal about this.” -- Gonzalo, Chile