Help me with some counter-arguments here

(NOTE: This is one of those threads that’s hard for me to categorize, so I just threw it under MPSIMS. Again, if I’m wrong, my apologies.)

My best friend is a massive conspiracy theory nut and constantly tries to push them on me. Most of his ideas I’m able to poke large holes in (as a good example, he suggests that all prayers are acutally focused at Amon Ra, because, he states, we end our prayers with Amen, which he claims is just a derivitive of Amon).
Anyway, he frequents the site whatreallyhappened.com–a place I’m sure most of you already know about–and takes what they say as fact.
My base argument is that if you can’t trust the media (which he doesn’t), how can you trust a site that gets its information from essentially only other webpages that have the same about of credibility?
However, he doesn’t exactly buy this. Is there another argument I can use?

I have a page for people who get their info from dubious websites:

http://slithytoves.sytes.net/~dave/misc/moron.html

I should probably rename it to something less obvious.