Here's a website devoted to tropes.  Lists of tropes, forums
on tropes, discussions of tropes, etc.  The site started out
with TV tropes and moved on from there. I haven't had a chance
to explore too much of it, but I'm tickled by the concept of
plot coupons.

 http://tvtropes.org/pmwiki/pmwiki.php/Main/HomePage

If you don't get everything you want, think of the things
you don't get that you don't want.  — *Oscar Wilde*
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