Harry Potter and the Sorcerer's Stone (Harry Potter, #1)

by J.K. Rowling

“I never know,” Harry called to Hagrid over the noise of the cart, “what’s the difference between a stalagmite and a stalactite?” “Stalagmite’s got an ‘m’ in it,” said Hagrid. “An’ don’ ask me questions just now, I think I’m gonna be sick.”