First of all, sorrry for somewhat stealing your topic Hyoushitsu, but since there is a thread for the unluckiest game, why not the luckiest?
Last game, luck was incredibly on my side. There were 6 investigators with Nodens vs. Chaugnar Faugn with the BGotW herald with all the expansions in play (ignoring the CotDP mythos cards). At first the struggle seemed incredibly futile and pointless, but things took a better turn. First Barnabus Marsh appeared. Of course, he went down quickly and a doom token was removed. Then, Charlie Kane got a cult encounter that would devour him but would remove a doomer. He willingly obliged and a new investigator was drawn. Then Carolyn Fern got the EXACT SAME cult encounter soon afterwards (if I'm not mistaken, there's only one of those in the entire deck). She then proceeded to kill herself to remove another doom token. Finally when Sister Mary received a blessing, the Nodens Blessing card (you might have saw this coming) removed a doom token!
The game ended with a sealing victory with 11 out of 12 doom tokens on Faugn's doom track (well, not including the elder signs we used at the very last turn of the game) 4 tokens on the Deep One rising track, 2 rifts that were close to opening, and the Dunwich Horror was released screaming its head off, and the terror level was 7.
That game almost seemed like some divine power (Nodens perhaps?) had saved us from the brink of death.