If One Animal Was Made the Size of a Whale, Which Would Be the Scariest?

Judging by the amount of arachnophobia mods for videogames, I'd say "spiders" would be scariest if resized to whale size for most people.

Personally, I hate fast-moving (usually flying) insects, and all fish/crustaceans/non-mammalian ocean or river dwellers. So probably a whale-sized "carpenter bee" or aquatic insect (e.g. "lobster") would be scariest.