• 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.

    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.