Where the logic goes to die.
When a set is a member of itself, but only if it's not, and only if it's not, but not.
This is where the mathematicians went mad.
Read more about Russell's ParadoxWhen two opposite truths coexist, and they do, in a state of mutual contradiction.
This is where the knights went, "Hmmm... I think."
Read more about Buridan's Paradox