Fan Casting Funny Foreigner in Sort by Tropes

Foreigners are funny! Or so say a good number of comedy shows. The jokes practically write themselves; foreigners mangle the language (especially idioms) in funny ways, they are ignorant of customs in the show's home country, and they have their own bizarre little customs that make no sense. They will either be unsure of themselves, or (more frequently) totally oblivious to how odd everybody finds them. This is incredibly old, probably dating back to when cavemen joked about people in the cave down the field.