Hello. My Name Is Inigo Montoya. You killed my father. Prepare to die.
-- TV Tropes, just about every fifth page

TV Tropes is a wiki-style website that has already ruined This Troper's life. TV Tropes collects tropes and cliches present in well-known works of any type of media, mostly Literature, Anime, Live Action TV, and Film but also Fanfiction, Professional Wrestling, Web Original... even, for tropes that represent Truth In Television, examples from Real Life are given. Also, There Is No Such Thing As Notability, so tropers can even create a page for their own unpublished works.

In general, TV Tropes is a good place to discover Memetic Mutations and cliches and laugh at (unless you live in Soviet Russia) or find the hidden brilliance in your favorite works.

Your Mileage May Vary, but most people find this website extremely addicting, due to its size and the constant linking and potholing. (Note that these links all would be internal links on TV Tropes itself, making them much less obnoxious.) The site can also be very amusing, since the community enjoys jokes and self-demonstrating articles.

One of its subwikis is the Darth Wiki.