And the accessory at the bottom of the list which gets unlocked after buying the Tanaka Mask? A golden Tanaka Mask.
The best part is that you're also able to purchase the masks for DLC characters as well. If you've been wanting to see Miku dance in a Tanaka mask, you can make your dreams come true. (provided you've purchased the DLC to begin with).
The fact that Tanaka is in charge of the game's DLC is hilarious meta-comedy in general.
Nanako: Oh, I know what this is! It's called a bromance!
While playing as Adachi, you can have Yu as your back-up dancer. At one point during their fever, Yu will offer his hand to Adachi, only to have Adachi smack his hand away... and then smack him to the ground for extra measure.
At certain points, he will also do the Carlton dance.
In the story mode, Yu's first encounter with Kanami features her tripping over her own Crocs and smacking face-first in the floor. This in itself would just be a regular moment of funny, if it weren't for Kanami's reaction to realizing someone saw her out-of-costume. Let's just say her hammy declaration about how Yu should "forget he saw her" is more than just a little counterproductive.
Nozomi's interaction with Kanji is filled with hilarity with either her liking his bad boy attitude and going back to her shyness again. Teddy, Naoto and Rise chew him out for this.
Later, in Chapter 4, the chapter ends with Nanako leaving Kanami's apartment with the greeting "Bye-Bye-Kuma" - Which Kanami promptly repeats back to her. Only to realize half a minute to late what she just said and wonder what that "Kuma" is supposed to be. (For the record "Kuma" is Teddie's Japanese name and "Bye-Bye-Kuma" is how he would greet the party upon leaving the TV after dungeon crawling early in Persona 4, making this a Call-Back.)
In English it's changed to "Bearwell" and is just as cute and funny.
There's a large teddy bear in the background in Kanami's apartment, making her confusion even funnier.
Teddie is the one most eager to dance of the group... And repeatedly has chances to dance to pacify Shadows snatched away right before his nose by other characters. His repeated insistence that "he wanted to go" in a tone that suggests he's seeing the whole thing more as a relaxed Karaoke Night with his friends rather than a life-threatening situation is kind of cute but mostly just hilarious.
After the final boss battle, Rise is bizarrely calm about the fact that the stage they're all standing on is about to vanish and send the Investigation Team plummeting down into the sea of souls.
Kanami's Dance Coach is a gold mine of laughs, especially since he's a Large Ham. Special mention for when he first meets Dojima.
Coach: Oh, aren't you a hunk of a man. Just my type...[Beat] No, this is no time to think with my nether regions.
The special prologue you get for clearing all the tracks in Free Dance mode has the Investigation Team trying to say something nice about Kanji. Every single compliment, while sincere, is a backhanded one.
Tomoe's confession to the team, while it was suppose to show her frustrations, is funny enough since she blurts everything out in one go.
Followed up by Yukiko falling into one of her laughing fits and admitting she buys repeat volumes of manga too.
Then it's revealed that Tomoe has laughing fits like Yukiko.
Chie: This is too much! Dealing with just one weirdo was bad enough!
One of Chie's team-ups with Teddie involves him exiting the stage courtesy of Chie delivering a playful Galactic Punt! that sends him flying.
If Kanji teams up with Nanako during one of her songs, he'll make his entrance by saying, "All right, Nanako-chan, let's beat this song up!"
Marie makes a perfect Oh, Crap! face when she sees Margaret join in on her song during Fever Time. Harder to miss is a Big "NO!". The Fridge Brilliance kicks in when you think about how easy it is for Marie to get annoyed when she's relaxing in some way.