The worst time we ever had finding pennies was the time growing when we had a big glass jug from cranberry juice being used to gather pennies. The jug sat on the kitchen floor, which was linoleum in a pattern to look like a parquet floor. One day, when the jug was a little over half full, Dad went to pick it up and the top came up, the bottom and the pennies stayed down. The pennies scattered thither and yon, all over the kitchen floor. Which, much to our dismay, was a darned good match for all the colors of brown pennies can be. It was probably months before we "found" all the pennies, they blended in so well, and resisted sweeping pretty darned well, too!

I doubt any of us four sibling have ever collected pennies in a glass vessel again!