I like to go and tap them gently on their rear and watch them sway back and forth in their web in an effort to frighten me off. Never works of course and I'm sure I scare the dickens out of the poor dears but I just can't help myself! :-D
Saw a spider like that in Oklahoma, only the thing was the size of my hand instead of a fifty cent piece.
And it had the web strung across a pathway.
A good ten foot wide web at least.