These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Black Sheep Hit: Though "Good Riddance (Time of your Life)" is one of their better known songs, it sounds almost nothing like their Power Pop/Punk edge they are known to this day for.
Broken Base: Where do you start? This band went from 1990's party punk superstars to reinventing themselves as the 2000's replacement for Rage Against The Machine (mainstream political punk rockers) with back-to-back concept albums. Then, 2012 comes along and the band releases three albums in three months, a move that would kill any other band's career, but not them. Even as Billie Joe shuffled off to rehab right before Uno came out, the band is still popular and highly regarded for its genre.
But Warning has the biggest Ear Worm of their career... Sing it with me...
Going at it alone!
Now I'm on my own!
Lost and found!
Epic Riff: "When I Come Around", "Brain Stew", the bass riff of "Longview", the entire first half of "Panic Song."
"Wow! That's Loud".
Face of the Band: Billie Joe. Although, it's a rare band where most fans know the names of all three members.
Ho Yay: I hate to be that fan Billie Joe kisses every concert, but, it happens.
Especially seeing as, during a recent concert, Billie sang "So go do what you like/I'm having sex with Mike." And a picture from a very recent Canada show where Tré is on his knees in front of Billie Joe, who has a mic between his legs. Oh, and an old video of Tré and Billie randomly kissing (while shirtless) in the middle of a set.
Magnum Opus: Dookie, Dookie, Dookie. It's still their most acclaimed and commercially successful album ever.
"American Idiot", to a slightly lesser extent. If Dookie brought them into stardom, American Idiot solidified their place.
Memetic Mutation: Wake Up Green Day When Semptember Ends. The joke is of telling Green Day to 'wake up' when September ends, in vein to the song, Wake Me Up When September Ends, to the point where Green Day themselves responded to the joke on Twitter, telling fans to shut up.
It mainly comes off as understandable due to the song being about the death of Billie Joe's father and how he locked himself in his bedroom and told his mother to 'wake him up with September ends', so instead it comes off as uncomfortable and heartbreaking at that.
Misaimed Fandom: "Good Riddance," which Billie Joe wrote to express bitterness at his girlfriend for breaking up with him before going abroad, is exceptionally popular at weddings, Bat Mitzvahs, graduation ceremonies, and other events that involve slow dancing. Though to be fair, the lyrics aren't that bitter.
It could be argued that the real Misaimed Fandom is from the fans convinced that it's bitter even though there's nothing in the music or the lyrics that really suggests that. Billie Joe has even stated that while it was written after a breakup, he was trying to put his best face forward on it. The only thing to hint at bitterness is the song's Non-Indicative Title.
Nausea Fuel: The "Geek Stink Breath" video features graphic closeup footage of a friend of the band getting a tooth removed. MTV would only play it late at night, and a less graphic edit was used internationally.
No True Scotsman: Green Day was (and still is) the first of many bands to be subject to the "Pop Punk, not Punk" mentality that the punk subculture tends to hold towards many Pop Punk bands.
Signature Song: A few candidates: "Good Riddance (Time of Your Life)" is probably their best known song. However, "Boulevard of Broken Dreams" is their most commercially successful, while "American Idiot" and "Wake Me Up When September Ends" are all quite well-known. Aside from "Good Riddance," "Longview," "When I Come Around," and "Basket Case" are their most famous 90's songs. They've made a lot of well-known songs, though.
Snark Bait: To most of the punk community. The reasons vary from being punk at first to "selling out" with American Idiot, or with them never being punk in the first place just for "selling out" with Dookie. In any case "sellout" is the most pertinent phrase when it comes to derision against the band.
"Good Riddance (Time of Your Life)" being on Seinfeld, and "Stop When The Red Lights Flash" in Need for Speed Most Wanted 2012.
Tropers of a certain age probably remember the former song in connection with endless Photoshop slideshows of pictures from camp, high school, clubs, sports, etc. Overplayed doesn't even begin to cover it.
Squick: They originally planned to name their first major-label album Liquid Dookie, inspired by eating spoiled food whilst on tour and catching diarrhea. The execs shot down the idea, settling for just Dookie instead.
Tough Act to Follow: Dookie became this, as Insomniac, Nimrod, and Warning didn't get anywhere close to its success. Eventually, they achieved something close with American Idiot... which itself has become an example of this, too.