11.   An auto mechanic happens by and stops to help.

12.   And when a production flops, the producers can find out what happened by recovering the black box.

13.   Anyway these thirsty coelurosars are out on a sandbar when this huge and ever-hungry carnosaur happens by, and looks dinner in the eye.

14.   As we neared the bottom of the climb, just as we were starting to feel pretty pleased with ourselves, a couple of bridge workers happened by.

15.   At some polling sites, ballots lay strewn on the ground, handled by anyone who happened by.

16.   August is when they fall into the Gorge of Eternal Peril, where unspeakable things happen just by showing up.

17.   A deal seems likely, probably with Cleveland, Texas or Seattle, and Henderson expects it to happen by early next week.

18.   A maid happened by, bearing an armful of towels.

19.   A huge hit is not supposed to happen by accident.

20.   Actually, only the fans can make that happen by letting go.