|"Are you a wizard or not?"
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A peppery potion was used by Barty Crouch Jr, disguised as Alastor Moody at the time, in June 24, 1995. After Harry Potter returned from Little Hangleton's graveyard, Crouch dragged Harry to his office and gave him the potion to clear his mind, in order to question Harry about what happened; Crouch had to tip the potion down Harry's throat, which had a burning peppery taste.