Read the following from one of Bill's links and I'm glad I didn't have a mouthful of liquid at the time. It was in the How to Classify Your Spider section:

"Eyes

Of much importance are the eyes of the spider. How many does it have? How are they arranged? How does each eye's size compare to those around it? Most folks who are afraid of spiders don't want to get close enough to look at a spider's eyes, so consider getting a spouse . . . to do so."