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Youtube changed this; does not work anymore.
Long ago I noticed one video on Youtube, which I could see when it was embedded, but not on its normal video page. There you could see the message:
Title of the Video This video blablabla Content, for you blablabla
To see the video you would need to login into an account where you set your age to 18+.
After some tests one can say that most videos can be viewed with this trick :)
nidx/yt18/ (does not work anymore)
Just rewrite it from
http://www.youtube.com/watch?v=ID
or http://www.youtube.com/verify_age?next_url=/watch%3Fv%3DID
to
http://www.youtube.com/embed/ID
Search for “embed youtube video” in your $SEARCHENGINE …