How about bake it in a cake in the oven @ 200+ degrees?

Tape to a soccer ball, douse in petrol, light on fire and hand it to the nearest caravan park with a lot of drunk bogans. See how long it takes to be destroyed then...

Ok how about this...throw it into the air and as its gently floating back down wack the crap out of it with a cricket/baseball bat into a wall (yeah into a wall makes for double the hurties). Easy.

1.) Put a sony battery in it and test its heat resistance.

2.) Run a "Full Pass" through a camel or cow (End to end)

3.) Expose it the radiation found on an average wireless network and see if its brain gets cancer in 10 years time..

4.) put in your Back pocket and sit down very fast, or get drunk and fall down.

5.) put in front pocket of pants and walk past sharp corner of table, watch out you don't miss and hit something else

Definitely drop it in a jug of beer, multiple times, to see if it can survive a night out..

Tumble dryer? Drop it off a 30 story building? Tie it up in a graveyard surrounded by marinated lamb chops and wait for zombies to attack it? Sign it up to pron websites for some spam love?

Tie it up in the living room with its family all bound as well and start dismembering them in front of him.

Every time it closes its eyes cut off one of its finger to make it focus. Keep asking questions about his enjoyment level and when the last member perishes, cover him in petrol and sit him a little too close to the fireplace.

Thats is how you destroy something unbreakable.

Try the method I indadvertently used to permanently disable my old Nokia:

Drink a shitload of beer and vomit all over your phone in the back seat of your friends car whilst squinting hard, to steady your vision, and trying to see what time it is.

Ill buy the damn thing if it survives that :)

go to woolies and ask to use their hydraulic box crusher

Will it blend?
@Jonwah: Don't forget to drop it in a strong black coffee the following morning to help it sober up (didn't help the last Nokia we did it to)