Quarrel players, banning such words as "help," "train," "balls" and "shaft" from being played. While we can understand the potential risque-ness of some of these words -- especially "help," which we're sure was added at the request of the XBL customer-service team -- without context we don't see the harm in them.
These words are fair game in singleplayer (with the Family Setting turned off), but Microsoft adds an extra filter to Live play, developer Denki's Gary Penn told Edge: "Quarrel uses the Collins official Scrabble dictionary comprising over 110,000 words up to eight letters in length, including a huge collection of words deemed 'offensive' by Collins, such as 'arse', 'shit', 'wank' and 'fuck.'"
Other banned words include "start," "skid," "poop," "hung," "dice" and "god." We're stumped on how to use "dice" in an offensive manner, but we've seen "fag" flung around Xbox Live chat with alarming, unfiltered regularity, so we're not going to try to figure out Microsoft's regulation process here.