Lyric discussion by madiem929 

Cover art for Breakneck Speed lyrics by Tokyo Police Club

i dont understand the "forest fires underneath your bed" part

Forest fires are obviously destructive. The question is what the subject did. It could be an abusive parent-child relationship, it could be drugs, it could be a crime the subject of the song committed. Personally I think it's drugs. Perhaps the subject like the Joostie said stashed drugs etc. under his bed. The end of the song is a sober moment with the subject and the writer of the song.