Horror Hotline ( Hung biu hyn sin ji daai tau gwaai ang) (2001)

A TV journalist and her crew are in Hong Kong to do a report on radio shows. They choose to follow Horror Hotline, a radio show who focuses on supernatural things that happen to ordinary people. One night, while the crew was interviewing and filming the radio show, a man called to recount a story that happened during his childhood. The strange story happened to him and to his six other friends when they were in elementary school. One day, while playing around the school, they found a big head monster baby in a small abandoned warehouse. But strangely, right after the call of this man, the radio show began to receive other calls from unknown people who also saw or heard a story about a big head monster.

Part 1
Part 2