The lesson in this humorous and well-done 2006 horror/thriller is that if you piss off enough people, they're gonna piss back.
A weapons multi-national holds a team-building weekend in the mountains of Eastern Europe. As is normal in one of these corporate exercises in torture, the team fights among themselves while trying to convince the team leader that they're attempting to build unity.
Soon, though, they're too busy fighting a group of crazy killers, fresh from a war in which they faced the company's weapons, and hell-bent on revenge.
A smart and funny comedy with plenty of horror, yet not an excessive amount of gore, produced in the UK, but filmed in Hungary. Quite different, and very worthwhile.