This Mod will spawn a whole gang of homicidal clowns dressed as Ronald McDonald clones. They attack Peds, pull people from their cars and beat them up and they also chase and kill most Peds who fire guns - including cops. They are as tough as old boots and will gang up on people to fight them team-handed.
I'm not sure what the story is behind the Clowns,
probably just more wacky Rockstar humor ;o)