Cobwebs

[OUDoc]

My wife and my mother say they're dust/dirt/whatever. I say they're spider webs covered with dust/dirt. What are they?

[Boomer.....]

Here is your exact question:
and yes they are made by spiders (http://www.straightdope.com/mailbag/mcobweb.html)

[frankensooner]

Well, that is my one thing I learned today, I am now outie. ;)

[NormanPride]

Wow. Now we can't joke about it. THANKS.