So, this is how Professor Sleepy is like. Judging from the Defense Against the Dark Arts, Alex didn't expect the professor to have them singing in class in midday... Being the shy boy he is, Alex mumbles the tune to himself rather than singing it out loudly for the whole class to hear.

He knows what shooting stars are! The thing that killed dinosaurs millions of years ago. And so the boy raises his hand, "The... Dinosaurs killers...?"