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.
Also, "Waking Up In Vegas" and "Teenage Dream". "Firework" too, if this does not, hmmm...fire you up nothing will.
E.T. also deserves mention.
And "Part of Me", "Wide Awake", "Not Like the Movies" and "Thinking of You".
"By the Grace of God" also deserves special mention, what with its inspirational production and lyrics.
Broken Base: All 3 of her albums (4, if you include Katy Hudson) are very different from each other, leading to a lot of disagreement as to which one is the "real" Katy. Also, "One of the Boys" and "Teenage Dream" are best known for their upbeat pop songs, even though both albums include a lot of very serious songs. Currently, she is very popular with gays, but also very popular with Christians, and very popular with teenage and younger girls (who don't even understand her lyrics), leading to a lot of disagreement as to how to interpret various songs, as well as which of her songs is best.
Ear Worm: If you hear any of her songs, it'll play in your head all day long.
Part Of Me has been played every three hours on the radio, no joke!
"I wanna see your peacock-cock-cock, your peacock-cock."
"KISS! ME! K-K-KISS ME! Infect me with your lovin', fill me with your poison!"
"Baby, you're a firework! Come on, show 'em what you're worth!"
Critical Dissonance: According to the other wiki, "Teenage Dreams" generally received mixed reviews upon release from music critics. This album ended up tying Michael Jackson's "Bad" in amassing No 1 singles for the Billboard Hot 100(with 5).
"Not Like The Movies" is already a sad song but after said divorce, it's HEARTBREAKING.
Internet Backdraft: In some parts of the internet it is not wise to bring up "I Kissed a Girl", especially around lesbians who have been burned by girls like the one she's singing about. It's not pretty, to say the least.
Also, imply to a Katy Perry fan that she stole the idea from Jill Sobule, who wrote another song called "I Kissed a Girl" in 1995 and had a hit with it. Not helped at all by the fact that Sobule herself added fuel to the fire.
Lyrical Dissonance: While Lyrical Dissonance is an objective trope, there are a number of interpretations on what the lyrics of E.T. actually mean. Officially, it's a catchy pop/hip-hop song about falling in love with a foreigner. However, the lines "wanna be a victim, ready for abduction" combined with "fill me with your poison", make a pretty good case for the song being about date rape.
The "California Gurls" video has some, believe it or not. A woman entrapped in Jell-O, and one wrapped up like candy, looking totally lifeless. Okay, Katy lets them out, but it's a song about how girls from California are the best, not "Papa-fucking-razzi"!
Also she and her friends eat a living gingerbread man. He responds only by smiling. Also that last one may have been inspired by (or copied from, if you prefer) a scene in Tom Petty'sNightmare Fuel-filled video for "Don't Come Around Here No More". Considering that in Petty's video it's a woman dressed as the main character of Alice in Wonderland being eaten after becoming a cake from the neck down, and she looks pretty horrified about it, what happens to the gingerbread man is not so bad by comparison.
Dark Horse, suitors come to her in the hopes of wooing her with fabulous gifts. She responds by turning them into objects. I.E: A grill for her teeth, a cup full of wine to soothe her tongue after eating spicy Cheetos, an alligator purse, dice for a pimped out chariot. Only the last dude gets off luck since he gets partially turned into dog. Also that statue during "There's no going back" parts (shudders).
Buckley: Also, how unsexy is that "There's no going back thing"? If a girl was talking to me and all of a sudden, her voice changed into that, I'll be calling an exorcist to get it the fuck out of there.
"I'm Still Breathing", "Not Like the Movies", and "The One that Got Away" (especially now).
Additionally MANY moments from Katy Perry: Part of Me could make you cry, ranging from the Brazil scene to the bit about the pressure from the recording company's to change herself to the fan appreciation moments to over working herself with excessive travelling and of course the marriage problems related scenes.
What Do You Mean, It's Not Symbolic?: At the 2012 Grammys she performed "E.T." (a song about her love story with Russell Brand), the power went out mid-song and she then started singing "Part of Me", a song about her break-up with Travie McCoy reworked to fit her divorce with Brand.