I'm SERIOUS! They're just freaking me out! I know they're completely harmless but each time I see one of them without being prepared it scares the crap out of me! Once I was in a mine and I went around a corner and there was a squid (a waterfall ended there and lava was near, therefore he spawned) with his creepy mouth turned to me, moving his arms and I was like AAAAAAARGH!!!!! A MONSTER!!!!! DGZFTZFUIIZ! SAAAAAAAAAAAVE ME!!! *traumatized for life*
I could go around mine corners for WEEKS without thinking of that squid!
It even scared me too much to kill him - I just turned around and ran away. Actually, I needed to go there (there was the exit) but I couldn't and had to look for an other exit.
True Story!

none of them are scary

by far