I think they’re entertaining from afar, but infuriating up close.  

Talking about them with people who try to look at things from different viewpoints can be a lot of fun because you end up talking about not only how ridiculous they often are, but also why people could legitimately believe them.

Talking about conspiracy theories with conspiracy theorists is just a bad time, depending on the person, because they are very often so staunchly rooted in their beliefs that trying to turn them away from their craziness makes you a part of the conspiracy.