Though it's clearly intended to be a fantasy, the show promotes an unrealistic view of responsible behavior, as the main characters answer to no one but themselves and their only ambition is for outlandish adventures. However, friendship is a theme that recurs in most episodes, and the show has a sweetness and heart that belies its goofball reputation. Note: Potty humor (vomiting, references to "explosive diarrhea," and the like) is a frequent source of humor.
Finn and Jake use an array of weapons in their adventures -- including flame throwers, swords, and sticks -- though they don't usually use them against other people. In one episode, they stab and sever undead candy characters, who ooze green goo from their wounds.
Occasional very mild innuendo. A cupcake is asked to take his wrapper off during a game of Truth or Dare, for instance. A group of partygoers play Seven Minutes in Heaven.
Sporadic use of terms like "sucks" and "friggin'."