I usually don't think about it and when it is handed to me with the receipt, I just dump coins, receipt and all into my purse. Later on, I dump all of the loose change into a jar. Right now, I have several jars of coins, mostly pennies because my kids rummage through and take the larger value coins (especially quarters).
I recently had a chocolate-craving attack and went to a nearby convenience store to get my fix. I had left my purse in the car, so I dumped all of the change in the "take a penny" dish. As I did so, I noticed there was a 1970 Canadian penny in it.
We live in Texas, so it came a long way!
I did take that penny to give to my daughter. She collects coins not common to what we usually find, and has a Canadian penny that is smaller than this one, with geometrical edges: not round as the older Canadian pennies are. So, when I gave her this one, she thought at first it was an American penny and gave me that "why would I want this?" look.
We used to get them more often around here, but this is the first one I have gotten in change in a long time.
Anyway...I usually keep the change out of habit, but would say "keep it" if I thought about it. It isn't usually an issue though. I use my credit card for almost everything these days. It is so much easier to just 'swipe n go' than to dig for cash. Not to mention that 1% of the amount of every purchase is applied back to my insurance premium! By going this route, I get to skip a premium payment 3-4x a year. I am hoping that my mortgage company will start accepting online payments via credit card...that will add a lot of "bonus" premium! I have already added my phone; dsl; hubby's online game; and satellite tv service to this method. I would also love to add my utilites, pool service, and car payments...heck, maybe I should see if I can pay my insurance premium online via "their" visa.
If I carried a balance and paid interest on my credit card, it wouldn't be worth it. But, since I am able to pay it in full every month, it works great for me. I'll bet Visa hates me!