Do you mean ter tell me," he growled at the Dursleys, "that this boy—this boy!—knows nothin' abou'—about ANYTHING?" Harry thought this was going a bit far. He had been to school, after all, and his marks weren't bad. I know some things," he said. "I can, you know, do math and stuff.
J. K. RowlingHarry was just thinking that all he needed was for Dumbledore's pet bird to die while he was all alone in the office with it, when the bird burst into flames.
J. K. Rowling