Friends from the Interior

Why does my toilet always shut down when I'm about to receive company? Which leads me to one of my favorite expressions in Castellano: "voy despedir mis amigos del interior." Or in literal English, "I'm going to say goodbye to my friends from the Interior" and in real English, "I'm going to take a dump."

Considering all of my friends here in Argentina are from the Interior, I'm not too sure what that says about them or me for the matter. And why have my last two blog entries been about excretion?