When two kookaburras fall in love and their three eggs hatch, it seems they have the perfect family all ready to do what kookaburras do best... laugh.

But poor Bridget just cannot laugh. Or even smile. Her father and two brothers do everything they can to encourage her to start laughing, but nothing works. Serious Bridget just thinks they are being either silly or dangerous, until one day a magpie accidentally drops a nut on her head which starts a smile, then a chuckle, then an enormous laugh that spreads all around the neighbourhood. Bridget, who couldn’t laugh at anything or anyone, finally learns that sometimes the best laugh is the laugh you have on yourself.