Welcome to the twilight zone of topology, where mathematicians invented "clopen" sets just to mess with everyone's binary thinking! In topology, a set can actually be both closed AND open simultaneously—it's not an oxymoron, it's a mathematical reality. The look of confusion on her face perfectly captures every student's reaction when they first learn that a set doesn't have to choose sides. The entire real number line and the empty set are both clopen in standard topology. Next thing you know, mathematicians will tell us Schrödinger's cat is both "calive" and "dead." 🤓