A hoard of half-berserk fans clawed and clamored to get at Justin Bieber in New Zealand on Wednesday, knocking his mother down and stealing the hat off his head during an airport ruckus. Needless to say, the teen heart-breaker was not pleased, and has let his "Beliebers" know it.

"Not happy that someone stole my hat and knocked down my mama," he remarked on Twitter. "Come on people."

Later, he tested the nerves of his young fans by going bungee jumping. Watch after the jump.