There are numerous of inside jokes on nearly all BEMANI games, although solely the Pop'n Music franchise does not have much.
Inside Jokes on Pop'n Music
An original song from Pop'n Music 17 THE MOVIE. This song moderately gains central attention for MAD videos and Nico Nico Douga fan videos. ふしぎなくすり is frequently used for Pokémon fan videos, where one Pokémon uses a drug to physically overcome negative possibilities inside their bodies, by gaining spectacular abilities, and, most occasionally, transforming into human girls. Moni Moni serves as a origin to the meme for Pokémon characters and others, because of her transformation as a full-grown woman.
Additionally, in almost each fan video, there is a parody of the comic panel from the manga series Slam Dunk in chapter 109, "Accident", with the character Takenori Akagi shouting "Hurry up with the doping!". It was misprinted as "doping" instead of "taping", as a character not belonging into this series was drawn into the style of Takenori.
An original song from Pop'n Music 15 ADVENTURE and one of the most popular Pop'n Music songs. Similar to V and FLOWER, 凛として咲く花の如く has been infamously criticized for appearing on almost every BEMANI game, especially on non-BEMANI games.
Three, two, one, PUUUUUUSH!
Gratuitously romanized as "Tsurii, tsuu, wan, PUUUUUUUSHU!". Occurs in Pop'n Music Sunny Park in Attract Mode's tutorial. Many players find the sound bite to be very annoying.
A crossover song in Pop'n Music Lapistoria from GITADORA OverDrive. There was a bug on TOXIC VIBRATION's EASY chart, making the difficulty extremely hard. The video of the bug can be found here. This was later fixed at the same day.
Several of Japanese players dubbed this EASY chart as "TOXIC VIBRATION†LAPISTORIA", a joke of the term "†LEGGENDARIA" from beatmania IIDX 21 SPADA.
Inside Jokes on crossover BEMANI songs and Pop'n Music
A crossover song from beatmania IIDX 14 GOLD, and the remix of the title song. It also has a pop'n music version of it in Pop'n Music 18 Sengoku Retsuden. GOLD RUSH is widely known for Michael a la mode's atrocious, but hilarious vocals.
A misspelling of the KONAMI logo, which becomes a widespread joke. It first appeared on GUITARFREAKS 8thMIX Power-up ver. & drummania 7thMIX Power-up ver., where the print of "KONMAI ID" was found. Here are some Pop'n Music banners with common misspellings or KONMAI jokes, before having their errors fixed.
And here are the misspellings that are recently not fixed.