Is an irrational fear not so irrational if a rather large number of people have it? If you don't have a problem with spiders crawling all over you, maybe YOU are the irrational one. A new survey had Americans rank their biggest phobias.

Here are the 10 most common ones:

1. Acrophobia - a fear of heights.
2. Arachnophobia - fear of spiders.
3. Claustrophobia - fear of tight spaces.
4. Ophidiophobia - fear of snakes.
5. Thalassophobia - fear of deep water.
6. Necrophobia - fear of death.
7. Glossophobia - fear of public speaking.
8. Coulrophobia - fear of clowns.
9. Trypanophobia - fear of needles.
10. Entomophobia - fear of insects.

Source: Yahoo

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