Nightmare Fuel / Justice League: Doom

  • Bane's attempt to kill Batman: Beating him unconscious, then burying him alive in his parent's casket, with their remains still there.
  • Ma'alefa'ak's attempt on J'onn's life. Imagine being invulnerable to fire but still feeling the fear and agony of being completely engulfed - and even throwing yourself into the freaking ocean doesn't put the fire out. Worse yet, Ma'alefa'ak expected J'onn to burn for weeks.
http://tvtropes.org/pmwiki/pmwiki.php/NightmareFuel/JusticeLeagueDoom