What do people think of the idea that as soon as a question or question title contains certain key words (perhaps a volume of key words), in much the same way it suggests that your post might be subjective, it suggests that perhaps you're on the wrong site?
E.g. on ServerFault, every time someone uses the words "Home Network" or something similar, it popups up a little box "If your question is relating to a home PC or a home network, it belongs over at Super User." (obviously the phrasing needs to be worked on).
Or on any of the sites, if the question contains the name of the site (e.g. Super User Colour Scheme hurts my eyes), suggest the Meta site.
This would obviously catch the question before it gets voted to close 5 times (which on SF can take quite a while, as there's only about 35 3k users, and obviously even fewer on SU).
Prepares for a flurry of downvotes and "Exact Dupe" even though I can't find the dupe