Spiders--and women--oh and spider women.
(full marks for guessing the film there.)
I actually used to be terrified of spiders but I've managed to phase that down to a fierce mistrust. I look at it the same way as I did the first time I saw the movie Labrynth, "Never trust anything that can walk on the ceiling!".
My mother is terrified of moths, which always get a chuckle from me.