The Onion's parodying, in part, the tendency of real news media to keep repeating the same threadbare information again and again as a breaking story develops, since they have nothing substantial to report at the moment, but they have to keep covering the story. For example, one MSNBC expert's analysis of a dark spot in a photograph was "it's definitely... definitely something that's ...there". He was probably trying to say it's not a spot on the lens, but still...
Scott Goodyear, a former Indy car driver turned commentator for the Indycar Series for races on ABC. I told my dad he is so obvious and my dad didn't believe me. After some time my dad told me after he though about it he realized that Scott Goodyear is obvious. Needless to say it has become a running joke for us that anytime someone says something obvious we say that "Scott Goodyear has started doing x".
In TV Tropes, tropers will pothole a word, phrase, etc. that is considered to be... well... completely obvious, to this page.
"Five hats means that five tropers think it is ready to publish.". At least partially obvious.
Also, this very page is about a trope which highlights easily discovered events that are pointed out to the audience, as if they had no clue what was going on. This trope is called "Captain Obvious" and it's on the website you're currently on called TV Tropes (the url address is http://tvtropes.org/). On a side note, TV Tropes is a webpage which features articles about multiple tropes seen throughout many forms of media, such as literature, live-action T.V. shows, anime/manga, video games, comic books, and in several cases, even real life!
Like any other siblings, DZ twins may look similar, particularly given that they are the same age. However, DZ twins may also look very different from each other. They may be of different sexes or the same sex. The same holds true for brothers and sisters from the same parents, meaning that DZ twins are simply brothers and/or sisters who happen to be the same age.
The U.S. Air Force Symbol is the Symbol of the U.S. Air Force.
Every Wikipedia article about integers is worded in such a way. They mostly exist because of their meanings in fields of science, or symbolicism in religion, in media, slang, etc.
"A barn door is a door characteristic of a barn. They are often/always found on barns..."
Several animal articles will seem redundant if you know the basic information about the animal in question. For example, referring to "a venomous viper" is common. (There are no non-venomous vipers.)
The annoying YouTube meme, "Thumbs up if you're watching this in [current year]", which is posted on videos with some kind of nostalgic value. The default snarky reply is, "No, I'm watching this in [year in distant past or distant future]."