1979: Trelawny reveals this nifty prophecy to Dumbledore
1980: Harry Potter is born
WHAT IF: Dumbledore (and maybe the Order of the Phoenix) made a list of all the people on their side who qualified (defied Voldemort the right number of times) and gave them fertility potions and stuck them in a room to produce...THE INCARNATION OF THE PROPHECY!!!
Harry wasn't born by chance; the Potters realized that if they got it on immediately, they could have a child potentially around the end of July. Harry was MADE specifically to destroy Voldemort, manipulated into existence by a desperate group of people willing to try anything (especially something that involved sexual intercourse) to win the war.
Wadda think? Come on, you know you love this one. It just makes sense, dammit! Let me know what you think, Priestesses! Am I hired?