Blind Luck
Finding an object required by pure luck in a time of need.
walking round your house searching for your car keys when you have an interview in 45Mins and you manage to find your keys in time. As you came across them by very fortunate chance.
john looked for his mouth guard on the field and randomly stubbled across it by blind luck.
john looked for his mouth guard on the field and randomly stubbled across it by blind luck.