I'm sure it's happened to everyone. I keep all my clad finds in a container until it's full, then tote them off to the coin counter. I clean these things up but occasionally something slips through. In this case I'm sure I thought I picked up a quarter and paid little attention when I was cleaning. Now, admittedly it's not of any value, but it does highlight the ease with which something can slip though when you aren't paying attention. It wasn't until the counter rejected it twice that I noticed that it wasn't a quarter.