There are a couple of "in" jokes re Arequipa and Lake Titicaca. The Arequipians insist everyone needs a passport to visit (even other Peruvians) because everyone wants to go there - understandably. They call it the White City, famous for it's volcano, "Misty".
Lake Titicaca is partly in Peru, partly in Bolivia. The Peruvians say the "titi" (much like it sounds in English) part is in Peru, and the "caca" (poop) part is in Bolivia. The Bolivians probably don't quite see it that way.