Just like any good cult, the leader, in this case, Tom Bishop, is all knowing and is never wrong. He is obviously more intelligent then any previous thought genius's or founders of this thing so called "physics".
Tom Bishop is all knowing, bow before him.

But on a serious note, this Flat Earth Society has such a small following for a reason. You can't prove someone who is out of their mind wrong. This forum is just a bunch of crazies getting together, wearing their tinfoil hats to keep NASA out of their heads, and prove any naysayer wrong with a witty one liner argument. Dancing around the idea of an actual intelligent argument, they often resort to the child like antics of answering a question, with a question. They try to convey intelligence with the sheer amount of followers to support and attack a naysayer.
Ultimately, this forum is a fail. NASA is not a conspiracy, the moon landing wasn't staged, and the Earth is round. Prove it you say? Just look at one of NASA's published pictures.
If you still don't believe me, wait until Virgin Mobile launches their commercial space shuttle and buy a ticket. If you manage to afford a ticket you'll probably still say, but the window is concave! Giving the appearance the Earth is round!
You can believe the Earth is flat, I really don't care. But if you put yourself publicly out on the internet, you will get a response from us naysayers.
Even though I'm arguing right now, I'm not all serious about it. I find this site too damn amusing to stop reading.