All products of Sensei's curse, I'm betting. I wonder if the "Oops! All yanderes!" aspect is also a product of that curse -- though it does beg the question: Why aren't the reporters also affected? Unless.... :MonkaW:
People say he's going to die horribly but the fact that he's still alive while being this dense is nothing short of a miracle. There must be some sort of divine intervention keeping him alive. That's the only reasonable explanation as to how he goes through all of this despite being literally surrounded by loved obsessed students all across the city.
I'M GOING TO STEAL EVERY CATYLIC CONVERTER IN THE TRI-STATE AREA, AND YOU CAN'T STOP ME, PERRY THE PLATYPUS! WITH MY CATYLIC-STEALER-INATOR, EVERYONE IN THE TRI STATE AREA WILL SOON LOSE THEIR CONVERTERS!
Ridiculous amounts of stretching in this post aside, the voice line addressing Ayaka is indeed so out of nowhere it's hard not to see it as intentional jab.