We do have jumping spiders. They're harmless.plastic_window said:We can complain about the weather, but it's either that or jumping spiders and I know which one I'd rather have. But then again! Great Whites spotted off the coast of Scotland, apparently. So I'm not swimming any time soon.
Top scary animals:
humans
candiru
deadly jellyfish
hookworm
mamba / cobra / krait / that kind of deadly snake that doesn't warn you first
plasmodium (one of those nasty things mosquitoes spread)
brown recluse spiders
black widow spiders
scorpion fish, lion fish and that kind of thing
Komodo dragons, because their mouths are filthy.
I'm not that bothered about most sharks. Bull and tiger are kind of bad, but they're not that bad and it's easy to not share a room with them. You don't have to worry about them curling up in your shoes at night.

Basking sharks, whale sharks and dwarf sharks are particularly easy fish by which to remain untroubled. I'm too big! Even many of the large carnivorous ones are occasionally recorded coming up for a good rub and scratch from a friendly diver. They clearly don't attack everyone they meet. [http://www.youtube.com/watch?v=p1nPHZ6joaU] No way do those fish or these ones [http://www.youtube.com/watch?v=tvyRypo6YqA] not know the divers are there.
Here's another scary animal: http://www.dpd.cdc.gov/dpdx/html/schistosomiasis.htm
Judging by the papers here, the world's scariest animal is a pig with a runny nose.