At the wife's request, found out how to take out an Aussie SIM card from her new smartphone (she bought an unlocked smartphone when over in Oz recently) and put in her UK one, without the proper tool (thanks Google). On her expressing incredulity that I'd been able to do it, and then asking how I did it, I explained that there was a special tool for it but she hadn't got one, but I'd found a workaround. "Oh, that's what that little screwdriver thing is that fell out of my bag. I did wonder......"
(Goes up in wife's estimation...)