* AwesomeMusic: Say what you will about the game, but its anime style soundtrack was pretty awesome, particularly for the AOA and their chilling environment track.
* CrowningMomentOfFunny: While Confusion is annoying, all but incapacitating the afflicted Digimon, it is also absolutely hilarious, replacing the battle menu with nonsensical commands like "Laugh", "Mad" and [[GettingCrapPastTheRadar "Seduct"]]. Choosing one either makes the Digimon attack or, alternatively, yields a completely useless message like "[Digimon name] Shiny white teeth!" or "[Digimon name] Tears are salty!". Even the [[http://www.youtube.com/watch?v=AyfnOqUyJac music]] goes absolutely bonkers!
* DemonicSpiders: The Musyamon in the Gecko Swamp and the Jungle Grave, who hit unusually hard for random encounters for that level.
** Purple Numemon, high defense, high attack, if it hits you, your stats are lowered. Oh, did we mention that it is everything you will ecounter at the time where the random ecounter are at best half as powerful as said Numemon.
** Amaterasu Server in general, see the example above ? In Amaterasu, everything you ecountered are at least as powerful as said Numemon. There's a reason that the plot ordered you to visit the Jungle Grave right before Amaterasu Server.
* NightmareFuel: Amaterasu Server's version of Divermon's Lake; the reddish liquid where the water would be looks very much like blood. The Divermon happily swimming in it doesn't make things better.
** The Jungle Grave. The theme itself is creepy, and the fact that many players probably won't have done the ForcedLevelGrinding needed to simply survive one second in it means you probably got your butt kicked when you first got here.
** The whole premise of getting trapped in a video game is full of FridgeHorror, especially since Digimon Online does not utilize NarniaTime. Just imagine what it would feel like to hear that your friend or [[ParentalAbandonment family]] [[AdultFear member]] has essentially been trapped in a pod, their conscious in a virtual world with ''no way of getting them out''. One random NPC also worries about her being unable to feed her dog now. What if she (or any other pet owner playing the game) lives alone and there is nobody else around to care for her dog...?
** The whole Digimon World turning into Oinkmon is quite creepy.