Quite a few guests and quite a few topics make me either turn the show off or yawn knowing that it will help me get to sleep: Steve Quayle, Whitley Streiber (both of whom should have a "Deliverance"-style duel to see which shares their stream-of-consciousness bullshit fastest), Michio Kaku (who manages to make the same points over and over again while referencing space operas like Star Wars), Linda Moulton Howe, Glynnis McCants, Ed Dames, Michael Cremo, Ice Age and earthquake guy (who is so boring and repetitive I can't even remember his name), Lionel Fanthorpe (sweet guy but he should be restricted to an hour), Jon Hogue, and uber-turd Mish Shedlock come to mind. It's not always them personally or their topics, but it is one or the other.
In terms of the topics, I couldn't care less about D.B. Cooper, comic books, zombie apocalypses, the so-called phantom planet and Zecchariah Sitchen, giants, ice ages, meteor strikes, John Titor, so-called "ancient archaeology" and others. It's not always these subjects that bothers me so much as the discussion is pretty much the same and goes on way too long. If there interviews were more interesting or the people themselves had something more original to say I might actually enjoy listening . . . however, for the most part, there's nothing enlightening to these show topics.