For anyone over 50: When you are out in public, for whatever reason, always, always, ALWAYS return things (keys, credit cards, wallets, whatever) to wherever you normally keep them when walking around or shopping.
Especially at this time of year when places are crowded and clerks are rushed...it's easy to get a bit flustered and when you do, you are apt to put something down that you OUGHT TO HAVE put in your wallet, or put something in a pocket that you NEVER USE for anything.
Of course, what I'm getting at is that later on panic will ensue when you can't find your debit card or your key or whatever.
Sigh.