Because of the volume of replies in this thread I have to say that my number one is
THE UNITED STATES POSTAL SERVICE!
2) The disclaimers on pharmaceuticals. For example, one of the potential side effects of certain sleep meds is drowsiness. Duh, ya think?
3) The 72 virgins thing, again, but for a different reason. How long does this bomber dude think that "paradise" is gonna last after 72 ex-virgins all start bitching at him simultaneously about not taking out the garbage.