Box-o-Truth is a classic website from "back in the day". Box-o-Truth originated when the authors were having a discussion and one of them said "Let's test it and find out"
The site was a roaring success. Readers started contributing "I call bullshit" and the authors happily obliged their readers.
A few of my favorite posts:
Many, many more posts at the site. Not a bad way to spend part of the day when you get snowed in.