Yey, different countries/cultures have different traditions. Film at 11. If you want to be useful, set up a site/wiki that can describe the different traditions in different countries. That would be useful.
For example (http://wikitravel.org/en/Britain#Respect):
Allow some personal space between you and others in queues and elsewhere.
You will usually find this in such places as cinemas. Generally, unless
people know each other, you will find they will usually choose to fill up
every row of seating and keep as much distance of possible until there is
a requirement to sit directly next to each other. Exceptions are in very
crowded situations where this is impossible, like on the Tube.A wiki on cultural differences is a really good idea, though.