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.

See that air-pressure equalizing vent in every harddrive? Inject Sulphuric Acid into it.

The hidden wireless box idea is known to the Party Van and DEA-- and they hate it, because it works, and they then need to get another 3-4 warrants to find the thing (because it may be on other people's property or the like..) A sensible crim would have a deadman check running on the hidden server too.