I saw a joke on an American late-night show about that Germans fold their toilet paper. I got confused. As a German myself I thought "Wait what? What's wrong with that?" and I assumed North Americans use single sheets of toilet paper. But recently I watched an episode of "F is for Family" where workers at an airport complain about having to use single sheets.
After some research I found that it seems to be best practice to use more than single sheets (see e.g. the presumably north-american website http://www.howtowipeyourbutt.com/), which, since "when in rome...", makes me wonder:
Is it common practice in North-America to use several sheets of toilet paper at once? If yes, why would the joke be funny?