They call it base jumping and adventurous Aussies are crazy for it - some like to keep it in the family.

Father and son Greg and Jed Smith along with eight others made their way to Norway to have a party.

“It is a hell of a birthday party and exciting to do with your son," Greg said.

With Jed turning eighteen and on his base jumping P plates, why not leap over a three thousand foot cliff with your kid?

“Watching him go off a cliff in front of you, knowing that he can do his stuff, knowing he can look after himself, it was a real coming of age," Greg said.

Greg is one proud father and when it comes to Jed - well it's in his DNA.

“Being brought up on a drop zone, being brought up around aeroplanes, it's in the blood," Greg said.

“It’s not really about age, it's more about your sense of adventure you know, going out there and having some fun and trying new things, getting out of your comfort zone more than anything," Jed said.

The thrill ride starts with a two hour trek to the exit point and from there - it's all downhill.

"During that time when you do the jump nothing else matters in life," Travis said.

Travis McNaughton is one of those Aussies who joined the father and son team on their extreme experience.

“It doesn’t matter you could have had the worst day, the worst week - when you go out there and jump it's just you," he added.

But the party tricks were far from over. How about tossing your own son over the edge?

“I thought it would be pretty cool having your dad throw you off a cliff," Jed said.

“There are not many fathers that throw their sons off a cliff," Travis said.

And after a little bit of practise it was time for the real thing.

“I put my arms behind my head and tried to look as relaxed as I could. But in all reality I was absolutely peaking and scared out of my wits," Jed said.

And where is Jed’s mother in all this?

“His mother said whatever happens to him will happen to you, that's how we were sent off on the trip," Travis said.

And it's not going to end here. Jumping Jed and his old man have more adventures planned.

“We're talking about a cliff in Brento in Italy … it's a four and a half thousand foot cliff with a good cafe down the bottom," the pair said.

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