[dmcfrxnv] Things done in public by some people

Create a list of things that are considered socially acceptable to do (and widely done) in public in some places (countries) but not in others.

A somewhat difficult list to put together, because it requires traveling to wildly different places around the world and noticing.

Many things related to sexuality will probably make the list.  What else?

There are, of course, the followup questions of why things are different, and what effect does it have.