Breaking Bad star Bryan Cranston helped to lighten the mood on the set of the grim Tv drama by stuffing prosthetic penises into his underwear.

The actor, who portrays chemistry teacher-turned-drug lord Walter White on the hit series, often rifled through the show's prop department to find items he could use to break the tension in between filming and his dirty sense of humour would frequently make his onscreen wife, Anna Gunn, burst into giggles.

She tells GQ magazine, "Remember, I spent six years seeing the man in his underwear. Sometimes less than his underwear.

"He would constantly try to appear with various... things on his... situation."

Cranston adds, "There's nothing better than a good penis for a laugh."