Anyways, what about something such as the Fatima Miracle of the Dancing Sun?
Well I did a quick google search and opened up a couple articles to take a look at it, but the first one I read brought up some sound points and some more evidence to the table that really changed the playing field.
Her own mother said that Lucia, the girl who claimed the miracle was "Nothing but a fake who is leading half the world astray." Friar Mario de Oliveira, who knew her well, described her as living in a "delirious world of infantile fantasies" and suffering from "religious hallucinations". There are alternate explanations for the children's stories, imagination and boredom being chief among them."
"Most of what's popularly reported about the sun incident, such as the colors and the spinning, comes from Father John de Marchi, a Catholic priest who spent years interviewing eyewitnesses to build evidence supporting the miraculous event. But more objective assessments of the eyewitness accounts have found very little evidence of a single shared experience. Author Kevin McClure, who also compiled eyewitness accounts, reported that he had "never seen such a collection of contradictory accounts in any of the research I have done in the past 10 years." If you were there, as a devout Catholic (otherwise you wouldn't be there), you fully believed in a miracle happening that day (otherwise you wouldn't be there), whether you personally saw anything or not you'd support the majority opinion, and probably go to your grave insisting that a miracle happened there. There's no surprise that Father de Marchi was able to form a consensus description of a spinning color wheel of a sun, and no need for any actual event to justify his consensus."
If you take a look at the article, it provides some explanations for what he thinks might've happened, they're a bit long so I didn't think I should quote them.
Of course, they're also speculation, either could be true, the important thing is that there are other fairly reasonable explanations than just contributing it to a miracle, which should always be a last resort.
Also, interesting, I didn't know that's where the term Devil's Advocate came from. But I think it's worth pointing out that most miracles pertaining to medical conditions are hard to disprove or prove because of the whole Doctor-Patient confidentiality thing.
Edit: Actually, wikipedia provides a nice summary of the arguments against it:
Seems like the common theory is that it was caused by staring into the sun and seeing spots. Seems a bit silly for so many people to fall for, but "Meessen observes that Sun Miracles have been witnessed in many places where religiously charged pilgrims have been encouraged to stare at the sun. He cites the apparitions at Heroldsbach, Germany (1949) as an example, where similar observations as at Fatima were witnessed by more than 10,000 people."