Ask Men has a list of 5 Things You Didn't Know about Seinfeld. I don't consider myself the biggest Seinfeld fan on the planet, but I do think I've seen every episode, and I didn't know any of this stuff. Maybe you die-hard fans will scoff at the list and proclaim your knowledge of all those little known facts and more.

For instance, did you realize that we never got to meet any of Jerry, George, or Elaine's siblings? We got to meet their parents, but each of them referenced siblings during several episodes and we never, ever saw or met them. That's actually a cool little insight to their characters--that they really don't want to see their siblings. In case you were wondering, Elaine has a sister (her nephew was the one who was obsessed with the nipple slip Christmas card), Jerry has a sister, and George has a brother.