(Cover) - EN Showbiz - Justin Timberlake has revealed that if he was a teacher, he would like to teach martial arts.

The singer-turned-actor, who is currently promoting his new movie Bad Teacher, said that karate would be his subject of choice.

The 29-year-old, who is starring alongside Cameron Diaz and Jason Segal in the comedy, portrays a substitute high school teacher.

"Karate!" he told MTV News when asked what he would teach if he worked in education. "We [Jason Segal and I] both love karate. We don't know it. Actually I know karate, and other Asian-influenced words."

Justin also revealed what type of student he was when he was still at school.

The multi-talented musician and actor revealed that he did well in school although some of of his teachers had a bad professional attitude like Cameron Diaz's character Elisabeth Halseley.

"I've had some teachers who were pretty rough, didn't really want to be there," he said. "I was a pretty good student." (C) Cover Media