Wordplay is a personal favorite. I am able to say without hyperbole that I have read the rules of nearly every RPG produced. I state this not to brag, but to provide sufficient impact when I say Wordplay is among the most efficient, evocative, and elegant rule sets you will find. On first reading, within 30 minutes, you will be knowledgeable enough to create a character and understand the basics of action resolution and be able to play. Further reading will provide additional rules which can add to the gameplay, but are not necessary, and could be brought in to your game as play progresses.
Don't be scared off by the "rules light" mention on the product page. It contains the perfect amount of rules to have an enjoyable game without having to worry about measuring distances between miniatures on the tabletop. With even a slightly experienced GM, this is a great pick-up game ruleset, also usable for childrens games, but it is in no way limited to such use.
I recommend it without reservation.
[5 of 5 Stars!]