Ahhh yes, TVTropes, where you can spend hours and even days reading the pages there.
I have been doing just that, too, for the last few days…but I’ve only read about 50 pages in that time, so recommend to me a favorite or funny page that you know of on that site, if you wish. 
What’s your favorite or best trope, in your opinion?
No Wiser, No Worse is my “favorite” as every series seems to use it; some more subtly than the rest.
My major “issue” with TvTropes is that it is limited in number of examples that you can add to the site.
Didn’t a spawn of TvTropes appear, with less censorship?
As for the OP, I don’t think I can pick a favorite.
Things Mr. Welch Is No Longer Allowed To Do In an RPG
There are a few versions of this. It’s very funny.
Huh. That trope doesn’t even come up when I search for it on the site.
I Googled it and couldn’t find it. So, I didn’t learn anything about the trope, but I can’t say that I really lost anything, either.
Ha! Sure, I get what it’s about just from the title, but I always enjoy reading their write-ups and examples.
Probably the simplest way to find interesting pages is to follow some links off the pages for specific works you like.
The Colbert Report page is funny all on its own, and links to probably 100s of funny tropes that the show has employed. Of course, it helps if you find the Colbert Report really funny, but you could probably substitute some other show that makes you laugh and see where it takes you.
Indeed, All The Tropes, created in response to the censorship panics, and working from an initial copy of TV Tropes’ database—made before TVT rather abruptly (and a bit suspiciously, IMHO) changed it’s Creative Commons License.
My favorite TV Tropes would be the Holy “Fridge” Trinity, based on the idea of coming home from a movie, opening the refrigerator for a snack, and suddenly making a connection about the movie that you had missed before. Key examples include:
Fridge Brilliance: Many will disagree, but I felt the final scene of The Sopranos was a work of genius, despite hating the ending at first.
Fridge Logic: If E.T. could fly at the end of the movie, why didn’t he fly at the start of the movie and save himself??
Fridge Horror: Endor Holocaust
If I may be forgiven for self-promotion, I’m proud of two that I started that were found Tropeworthy:
Shame there’s no category for “Radio Sitcoms”, as “Bad to the Last Drop” would be perfect for the exchange from Cabin Pressure: “Nice hot cup of coffee!” “Augh, it’s cold!” “Nice cup of coffee!” “It’s horrible!” “Cup of coffee!” “I’m not even sure it’s coffee.” “…cup?”
If you’re at all interested in the currently in development game Starbound…
As for Tropes themselves, considering what board this is: Cow Tools!
There is one for “Radio” generally, so it would fit there.
This joke has been recycled a few times, most recently that I know of on Sherlock.
I’ve always greatly enjoyed the Useful Notes section, particularly the descriptions (for better AND worse) of every American sports franchise, and also the one which covers all 50 states (The Several States).
I checked out All The Tropes and it is identical to TV Tropes in a lot of ways. Like same examples and specific wording. How were they able to basically copy/paste another website? What’s the backstory there?
They downloaded the database—some automated process, I don’t know the details, offhand. This was actually permissible—and please, anyone better in the know, correct my errors or oversimplifications!—as TV Tropes uses a Creative Commons license. Basically, allowing anyone to "copy and redistribute the material in any medium or format…remix, transform, and build upon the material…for any purpose. Which is fairly common for online wikis, as I understand.
Aha! Here we go—a better explanation, along with more of the history, from one of the people behind ATT, and the guy who did the site rip…including the note that, as of November of last year, TVTropes is technically claiming “irrevocable ownership of” of material added on their wiki.
(Pause for uncomfortable murmuring)
Uh, and my personal favorite trope, at least at the moment: Reed Richards is Useless. “The observation that in some genres, characters can have fantastic technology far beyond our own, yet this technology only gets used to solve equally fantastic problems.” For example…comic book characters who could easily use their science or abilities to solve real-world problems, but use them only for finding better ways to punch people in costumes.
A trope I find both annoying, infuriating, fascinating to ponder, and sardonically hilarious. That, and it’s sister trope, Cut Lex Luthor a Check.
It’s hit and miss, but there is some genuinely funny stuff described and linked to from Crowning Moment of Funny.