[angkor]

More:

Build a bootable Linux USB stick.

Know the best way to zap a CD (microwave it, 5 seconds!)

Understand the early history of telephone phreaking
http://artofhacking.com/tap/tap/index.htm

[KarlInOhio]

Know the best way to zap a CD (microwave it, 5 seconds!)

And it's fun to watch too. The burnt in spark pattern will keep it from ever being used in a drive again, but if the CIA or NSA digs through your trash they'll still be able to get most of the data off of the disc by reading it with a microscope.