A childhood belief about criminals

I was very confused by the idea of money laundering. When I was little, my mother always told me to empty my pockets of spare change before putting my dirty clothes in the laundry. I watched a lot of crime movies with my father as a child, and I thought I had to take the coins out to not commit money laundering, which was a serious crime. I later learned as an adult that money laundering had nothing to do with the actual wash, and my mom only wanted to avoid the coins rusting the washer, not saving me from federal prosecution.