Misunderstandings across Time, Space, and Culture

I love the above explanation of the origins and customs of Christmas, offered by someone from another world and time, in one of the Doctor Who Christmas specials. It is a nice satirical way to make an important point, namely that we often misunderstand the past, and the customs of other cultures even in the present.

There are quite a few facets of history, culture, or religion that parallel this, or at least seem to be already headed in that direction.