|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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The knife of Sirius Black is a foot-long knife that he carried after he escaped from Azkaban. He used it to try to kill Peter "Wormtail" Pettigrew in Gryffindor Tower in 1994. Unfortunately Ronald Weasley thought that Sirius went over to the wrong bed and tried to kill him.