How to explode a hard drive

I know this isn't strictly tech, but I felt it's the best place for it.

People talk (on 4chan and such places) of raids by the police on their house to recover hard drives due to suspicions of CP or of pirated content.
I was wondering if anyone knew of a case where someone actually managed to destroy their Hard Drive, either remotley or before anyone could get to it, or any stories of the sort.
Could it hypothetically be fitted with some sort of... remote water filling thing?
Post anything relevant please.

>>58
A magnet powerful enough to erase a harddisk from a couple feet away would be so powerful I'd be dangerous to operate. Metal objects would fly towards you at dangerous velocities. That story is total bullshit.

A magnetic disk has a low permeability and uses a strong magnetic field at the drive head to write bits. And remember, magnetic field strength descreses according to distance^2.

An encrypted volume appears as nothing more than random data. They can't prove it's encryted data as long as you have plausible deniability.