That old CRT monitor isn't as worthless as you might think!
Don't throw it away, hack it!
This instructable will show you how to turn that old dusty monitor into a personal electric fence!
WARNING: I shouldn't have to tell anyone working inside a monitor that there is a very real danger of being electrocuted if you touch the wrong thing. (You did unplug it first, right?)
SECOND WARNING: If you have a heart condition or a pace maker, you obviously should steer clear of this hack.
THIRD WARNING: The monitor I used for this hack was a small one. The voltage was quite high, but the current is not enough to harm you. It's enough to get your attention, but could potentially have the same effect as a very powerful stun gun.