Banana slugs are pretty cool. They don't really make me squirm so much as they make me alternately go "Ewww!" and "Coool!" We saw a couple once while hiking in Oregon. I kept wishing I had a gigantic container of salt.
Sea anemones disgust me. I've had many chances to touch one at aquariums and tide pools. I've never had the guts to do it. I have this phobia of a sea anemone closing around my finger and clinging to it and somehow tearing it off or something.
