Adaptors are the bane of my life!
No matter how many you have, they all vanish into thin air when you urgently need one; or you find dozens, herded together like Wildebeasts stretching to the horizon - and they are all the wrong ones!
Living in France, with a lot of brit and french tools, camera, toothbrush and chargers etc., plus visiting the anklebiters in Blighty regularly, I have to put up with French to English and vice versa on an almost daily basis.
For some reason they are all flimsy china junk [sic], prone to falling out of sockets, overheating & disintegration.
Oh for an Eu wide standard!