HOW TO TRAIN YOUR DRAGON

'I like dragons,' says Trefusis Minor, 'They can throw fire, they're quite like snakes and lizards and they can fly. And they're really quick. And they have armour. The most important thing about a dragon is its wings, its fireballs and its teeth.'

Trefusis Minor is obsessed by dragons. I'm sure many more experienced parents will nod wisely and tell me that dragons are simply the next turning on the left after dinosaurs on the map of boyhood. Mr Trefusis and I are not experienced parents - it's a case of the blind leading the blonde as we struggle to keep up with each new enthusiasm as best we can - though I think we're both secretly relieved we no longer have to remember that a compsognathus was the smallest of the carnivores, or struggle with the pronunciation of Pachycephalosauria.

Anyway, I asked Trefusis Minor why he thought dragons were so popular. 'It's because of St. George,' he said sagely, 'And St. Michael. Everyone likes dragons, even the bad ones.' And, really, that was as much as he'd say on the matter. But everyday he draws pages and pages of them: some have two heads and look ferocious, some are equipped with a terrifying arsenal of weapons, some look amiably bovine, but no two are identical.

Actually, I think the dragon fascination started with a trip to see 'How to Train Your Dragon', a film full of adventure and beautifully realised dragons in exhilarating flying, swooping, gliding and fighting scenes. The hero, Hiccup, is a young and appealingly useless Viking living on the beleaguered island of Berk, who defies tradition when he befriends one of his deadliest foes — the ferocious dragon he calls Toothless.

The film is inspired by Cressida Cowell's book of the same name, subsequently a huge hit at bedtime with Trefusis Minor, though he maintains he prefers the film - I hope his review, which I took down verbatim, makes up in enthusiasm what it lacks in coherence.

'Hiccup is brave and very, very intelligent, he likes the dragons and wants to be friends with them. He didn't want to kill them. In the book he can speak Dragon Language: he can't in the film but he captures a Night Fury which is the best dragon there is and he calls it Toothless and he does find out by himself how to train dragons really well and he saves everyone from the Red Death.

In the book no one actually flies on a dragon but they do in the film and it's amazing when Hiccup flies on his dragon. In the book Toothless doesn't look very scary and he's a bit pathetic but in the film he's beautiful like a black flying snake with green eyes.'

Dreamworks 'How to Train Your Dragon' is out on DVD and Blu-ray tomorrow, Monday 15th November. It will almost certainly find its way into Trefusis Minor's Christmas stocking, and I shan't be sorry to watch it again either - I'm a sucker for films with unlikely heroes, and there are few as unlikely as Hiccup the Useless (later 'Useful') and his beautiful dragon Toothless.

And, as Trefusis Minor says, 'Dragons are actually in Real Life. they're different from ones in the films because they're Komodo dragons who can't spit fire or fly but they do have armour and they are dangerous because they can spit poison and they are big and scary and strong and can defend themselves'