Back in the days when I used to use cash to pay for nearly everything, one of my favorite things to do was to inspect the change I'd receive.
I had to make a cursory check to ensure that I didn't get a wheat penny or a silver quarter or nickel back. Then there were those times that I would get something totally unexpected, such as a $2 bill or 50-cent piece. Can you recall the last time you got a 50-cent piece as change? I surely can't, but it has to be at least 10+ years for me since I've even seen one, let alone had one in my possession.
Then there's that strange feeling, like you're doing something wrong, when you spend a $2 bill. Like you're letting it down by not collecting it. The clerk always raises an eyebrow, waiting for you to change your mind and withdraw the bill before it's too late. Or perhaps it is that sense that you're desperate for cash and this is all you got left (which has always been true in my case).
Either way, I don't run across them all that much these days, and I kind of miss seeing the old-fashioned design of the $2 bill and the awkward hugeness of the 50-cent piece.
My brain is a curious thing. It bounces from place to place, from the exceedingly strange to the terribly mundane. Every once in awhile, something will pop into my head that is just completely out of nowhere. Totally random.