When you join a new D&D group, you quickly get a lay of the land with your DM. Will they smite you and your party with a TPK in the first 20 minutes of gameplay? Or will they let you and your friends rot in the local witches' tavern, stuck on a 3rd-grade puzzle that your DM created without a guidebook? While there are many types of players and masters out there, it's best to find a DM who's balanced–as all things should be.
Perhaps after you and your buddies–the bard, a dwarf, and a barbarian–can stroll past a hooded merchant NPC with ghastly facial scars and a shrouded past, he'll give you some cursed item that polymorphs your bard into a swan. You'll be beset on a new quest to return him to his melodic human form! Exciting stuff. Afterward, your journey may bring you to the dragon's lair, a cave mouth with bones scattered at its opening and sulfuric steam rising from the darkness. What could be in there?
See, this is the kind of variety and imagination we want to see from our Dungeon Masters. While they play god in an infinite universe of their own making, players can scavenge the corners of our psyche to reminisce on the goofy, roleplaying threads of their own making. Because a balanced game of D&D is a session well-spent.