Anti-computer game lawyer Jack Thompson is to try banning Halo 3 for being too violent.
According to Games Politics, Thompson wants to get a Florida court to declare Halo 3 a public nuisance.
He attempted a similar stunt last year against Take Three's Bully game and failed to get anywhere.
The law he is using is one which is designed to deal with gambling and prostitution.
You can read the details of Thompson's case here and here.