Doing a Fiasco one-shot next month, looing for any advice from people who have played the game. I basically want to play the game as it was intended to be played so I can get an accurate feel of it. Any pitfalls to watch out for?

Don't think about the end game dice roll. Basically having an extremely bad or good collection of endings leaves you the largest pool of same colored dice, which in the final roll gets you usually the largest number for the "best ending" and essentially "winning." It's metagaming the table as if you cared about the final result -- and completely sucks all the fun out of the whole point.

Also, people will metagame regardless; cliques are real, often subconscious, and eventually petty. Kill any incestuous PC volley matches by introducing new NPCs in the scene every minute or so. Vote regularly against the table's "leader" (there'll always be one emergent) whenever they try to massage scene resolution in anyone's favor. Insist any couple in a romantic relationship do not play Fiasco together -- and if they do, ask if you can play a version without any dice mechanics outside 'character creation' and intermission.

If all else fails, find the most non-competitive group you can find, drink heavily, use the dice only for 'character creation' (it's really paired relationship creation) and nothing else, and keep the group under five players. I still recommend drinking heavily. Always keep in the forefront of your mind that the game at its best is a comedy of errors.

The only good games comes from a quality breakdown in which mayhem ensues and no one cared because they were having so much fun laughing.