Earlier quoted context omitted.
> Hmmm... Nope, I can't see a problem with getting people to stick a paperclip into holes around mains electricity! Sounds perfectly safe. What say it needs to be in the socket? A battery or a capacitor is all you need to make sure it can still a bit outside its sockets (you don't need much to clear the memory either). It could be a physical button too, no need for a pin.
The last thing I want to do is have to change the battery in my light bulbs.
I would still use a capacitor personally, but I said batteries because they could certainly work and Ikea does have a battery-powered light bulb with a button on it [1].