What's So Funny?

We all like a laugh but is the ultimate crack-up The Castle, The Chaser or Kenny, the plumber with a heart? Doug Hendrie goes on the hunt for our national funny bone.

Q: How Many Gay, Retarded Aborigines Does It Take To Change A Light Bulb? A: That's Not Funny

Offence at Ben Stiller's jokes about "retards" poses questions about just when comedy crosses 'the line' and becomes offensive. Melinda Houston reports.