Djent/ metal, cool and creepy video:
MESHUGGAH - Bleed (OFFICIAL MUSIC VIDEO) - YouTube
Pop/ electronic, some pretty dark imagery:
Eurovision 2013 Norway - Margaret Berger - I Feed You My Love - YouTube
Possibly the most disturbing video I've seen, because it reflects real life events. Hard-hitting for anyone who's ever been bullied. Post-hardcore/ screamo:
Escape The Fate - Ungrateful - YouTube
Tool... stop motion... what more needs to be said?
Tool - Sober [hq - fullscreen] - YouTube