I'm certain they've been said before, but Redeads are horrifying, the ones from OoT of course, the TP Redeads were boring.
I love the fear you feel as they stun you, leaving you to helplessly wait in horror as they ever so slowly make their way towards you.
I also found it indescribably creepy how they wait in the fetal position, and due to their palette being almost identical to the mud walls in Ocarina, it's often difficult to notice them until you're too close.