I've been watching this show now for a little while. These guys, though a bit pompous at times (though I think the main host, Matt Dillahunty, is just fine), are great! Watch this video and listen to the caller (who uses a fake name) and listen carefully to his voice. It is a well-known conspiracy theorist idiot who you will recognize immediately if you know who he is. He's calling in under a fake name so that he can argue with them without exposing himself for the fraud that he is 
anyways, he makes himself look like an ass (like usual) and Matt owns him. Additionally, Matt let him slide here, but in another episode, Matt actually let's the people know that it was him even though he didn't out him then and there. This shit is hilarious! 
So who is this mystery caller/famous conspiracy nut? Do you know who it is?:
