Fat chance!------------  Fall into one's lap---------------------- A free ride---------------------  Get a second bite/ two bites at the cherry--------------  Off-chance--------------------  It's anyone's call---------------  Luck of the draw--------------------- Take pot luck-----------------  Make hay while the sun shines-------------- Murphy's law-------------------  More by accident than (by) design--------------Play a waiting game--------------  Push one's luck------------------  That ship has sailed--------------------  Sitting pretty---------------------  Strike gold--------------  Strike (it) lucky  ----------------------- Tomorrow's another day----------------  Touch wood/knock on wood----------------------------  Vested interest----------------  Waiting in the wings-------------------  While the going is good-------------------------- Vested interest--------------------- Waiting in the wings-----------------  While the going is good-----------------