Anna Spanna don't listen to Frep, she's obviously bitter and twisted because she/he didn't get a call back.
Yes they make you do some strange things,but it's more to make sure that you've got a personality and are not going to walk around with your mouth twisted up like a tight cat's arse.
I would recommend going in with a great positive attitude and an open mind.You don't have to sing and dance on board, just have a personality.
Sorry this message sounds a bit jaded, but I've had a gutfull of people bagging other companies in their own profession.