I periodically start unintentional change jars.  I much prefer to remember to have change on me to give exact change as often as possible, I hate when change starts to pile up at home.  But I invariably forget, leave it in the car's ash tray, empty my pockets when I get home, etc.
 
We JUST cleaned out or change collection, which was $19.97 (we found a few more pennies floating around to make it an even $20) and CP brought it to work with her to exchange for a bill.  Fortunately, a public library always needs lots of change on hand, so we did them a service 
