The funny conspiracies for me are the "you won't believe this" police reports we read in academy. Real stuff so outrageous as to blow your mind. Usually if it is "an old saw" you can pick it out as urban legend. Then there are things that just so crazy they are true. Then there are fallacies that look great at first but violate lots of rules of logic. An example is the Clinton body count where you can fit evidence to a situation which leads to all kinds of wild speculation.

Unfortunately Snopes and Urban Legends aren't that great of sites to chase these things down due to the heavy advertising.