I know how rediculous it sounds that some people go into group interviews and take over the whole thing, thinking they know the answer to everything. And i know it sounds as if those annoying people would be looked badly upon by the interviewers but i have never been to an interview where those people didnt get thru! It happened in a Qantas one, Qatar and especially Emirates with me.
To me it seems like a 'look at me' thing and the interviewers have loved their loud mouths. To everyone else in the group it was extremely rude. But from my experiences it appears 'do anything to get noticed' and you're in.
