"This, sir?" said Dobby, plucking at the pillowcase. "'Tis a mark of the house-elf's enslavement, sir. Dobby can only be freed if his masters present him with clothes,sir. The family is careful not to pass Dobby even a sock, sir, for then he would be free
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"The Leaky Song" by Brad Mehlenbacher of Draco and the Malfoys