Kicking off with a hard rock performance, it was clear this was not to be your average assembly.

At first students at Dunkerton High School, Iowa, seemed grateful for this musical break from the norm - albeit with Christian-themed lyrics denouncing the evils of drugs, alcohol and violence.

But things took a turn for the worse when the event veered into an impassioned and unfocused rant against homosexuality, abortion and sex before marriage.