"Devil's Snare, Devil's Snare... What did Professor Sprout say? It likes the dark and the damp-" "So light a… — J.K. Rowling

"Devil's Snare, Devil's Snare... What did Professor Sprout say? It likes the dark and the damp-"

"So light a fire!" Harry choked.

"Yes - of course - but there's no wood!" Hermione cried, wringing her hands.

"HAVE YOU GONE MAD?" Ron bellowed. "ARE YOU A WITCH OR NOT?"

shortly after

"Lucky you pay attention in Herbology, Hermione," said Harry as he joined her by the wall, wiping sweat from his face.

"Yeah," said Ron, "and lucky Harry doesn't lose his head in a crisis - "there's no wood", honestly."

Source: Wikiquote · CC BY-SA 4.0