conspiracy theories

I thought this might be an interesting topic for the passionate conversationalists out there.

What if any, conspiracy theories do you place any creedence in? Note, I am a huge skeptic mostly. Personally I think that is most of these cases, people give Govts too much credit thinking they are able to keep secrets and are smart enough to pull it off.
There are so many to choose from, Marilyn to the Moon

The one incident that I could possibly entertain some sort of conspiracy on, was JFK.

Don't know if this is a good idea or not. We'll see :-)

I dedicate this thread to that guy who edits a weirdo magazine, has wild hair and appears on a lot of documentaries to state that Mayans were aliens.