Karaoke at the office Christmas party often leads to headaches, a sore throat and flashbacks you’d rather forget. So people have shared karaoke rules on Twitter, to help minimise those regrets.

Cheung Ka-pui, 16, Fung Kai Liu Man Shek Tong Secondary School This year our school will hold a Christmas party before the holiday, and the theme is "Let's Sing Together". Desmond Chan ...