No self respecting Evil Mad Scientist should be without one. In fact, you simply can't be a true blue EMS (Evil Mad Scientist) without your own...
DEATH RAY!

Cut steel, shatter glass, burn wood, chip rock,
and ignite flammable materials.

The Death Ray (actually a high power IR laser)
produces an invisible beam of heat that will cut
and drill through steel, ignite wood,
and destroy a wide variety of things at great distances. You know... for kids.

These hard-seal water cooled CO₂ laser tubes feature long, trouble-free life. Built for continuous use they are highly reliable.

All kidding aside, these are obviously quite dangerous and certainly not anything an a child should be allowed to get his hands on.
In fact, many adults we've met should not be allowed to get their hands on one.
They require the use of IR safety glasses and that the user be intimately familiar with high energy/high voltage devices.