They

My brother and my father have always been into jigsaw puzzles. They'd dump the contents of the box onto the kitchen table, sort out the end pieces to build the frame, sort the rest by colours, and they'd work through these monsters day by day. Dinner, naturally, would be served in the living room.

Sometimes, for fun, I would steal a piece early on. So that I could have the distinction of finishing the puzzle.

To me, jigsaws are incomprehensible. It seems that, given enough time, a brute force strategy will complete every puzzle.

Unless some jerk steals a piece.