"Adventuring Party!" is a "Party Game" style RPG. Its a good intro RPG as it handles standard fairytale and pulp adventure, its got solid mechanical choices built in (there isn't just one way to handle things) and can be learned, played (including character creation and building an adventure) in an hour. Its under 20 pages in pdf format.
from the introduction:
The game’s scope takes place in the form of an adventure scene that takes place in a dangerous location to complete a quest. The example first quest is to rescue the princess from the witches tower. The witches tower is the dangerous location, rescuing the princess is the quest, and whole ordeal is the adventure scene.