Since I enjoyed Lucky Star so much, I decided I should check this anime out, being referenced so many times in Lucky Star.
It's about a high school girl who is obsessed with aliens, espers, and other paranormal stuff. So she starts a club based on this, and forces a number of other people into the club. So far, up through episode 8, the show is mostly about the situations the club gets into while trying to satisfy Haruhi's unreasonable demands. There's also hints about a larger story, but I haven't watched enough yet to see how it plays out.
So it's kind of a mix between story and randomness, kind of like Excel Saga. Only less crazy. I like it.
Those who do not know history are doomed to repeat it.
Those who do know history repeat it anyway because they think they know better.