I was wondering if a doohickey exists that would let me plug Christmas lights into a lightbulb socket? My husband is sure he saw one once, when he was a kid, but I haven’t been able to find anything of the sort.
Most good hardware stores will have little devices resembling the base of a light bulb, with a ceramic or thermoplastic top in place of where the glass bulb would spring from it, which screw into lightbulb sockets and convert them into sockets for electrical plugs – as of the last I saw, solely two-prong, without ground, though.
It can’t be more than a two prong because there is no ground wire running directly to the socket.
Yes, they’re available.
Go to http://www.electronicplus.com/ and put the following number into the “search by part number” box:
758V-BOX
Unfortunately it doesn’t show a picture. I’m still trying to find one…
Wow, they really do exist! Thank you. Now I can have my glittery, gaudy, beautiful Christmas lights without the risk and expense of leaving a window open 
*pretend the emoticon has a Santa hat on.
Here are some good pics:
http://www.cornerhardware.com/productdisplay.html?item_id=222928&N=2199
http://www.cornerhardware.com/productdisplay.html?item_id=223111&N=2199
If the links don’t work, go to http://www.cornerhardware.com/ and search on the following item numbers:
002-125
835-125
Are these Christmas lights indoor or outdoor? If it’s the latter, read on…
Outdoor Christmas lights must be GFI protected. Light fixtures are usually not GFI protected. Therefore, if you use a socket-to-receptacle adapter, you must also use an inline GFI module. These can be purchased for less than $20. Another option is to indentify which circuit the light fixture is on, and replace the existing circuit breaker with a GFI breaker.
I’ve got two of those little doodads. For both of them, the outlet is not polarized, so I can’t directly plug any polarized plugs into it. Fortunately, I have a two prong to three prong adapter with the prongs also not polarized, but with the output side polarized, so I can use that as an adapter. The two prong to three prong adapters I’ve seen in the store lately have polarized prongs, so they wouldn’t work.
If you buy one, make sure that it’s polarized like the ones in Crafter_Man’s links (maybe they all are now, I don’t know), that what you want to plug into it is not polarized, or that you have or can find a suitable adapter to make it work.