Like it hot, scum?
Who: Vincent Crabbe
Source: Harry Potter and the Deathly Hallows by J. K. Rowling
Note: In the Room of Requirement, Crabbe and Gregory Goyle attempt to kill Ron, Hermione and Harry, and Crabbe uses a spell that produces strong, magical fire (Fiendfyre). Harry attempts to rescue everyone in question, but they escape and the room seals itself with Crabbe still inside.