When I was a snot of a kid we lived on a farm. BT. Before TV. Gramps did jig saw puzzles while listening to his radio. He had a table where he could leave them until finished. When he finished one, he would put it back in it's box as soon as he got another. He had a shelf full of boxed up old puzzles.
Once, I got some pieces of an old puzzle and put them among the puzzle he was working on. I laughed 'til I nearly peed myself watching him. He never said anything about it but one day at school I bit into my sandwich and found a puzzle piece. My thermos bottle was full of puzzle pieces too. Guess he won that round.