Ever wanted to understand how a virtual machine--like the Java VM, .NET CLR, or V8 Javascript engine--actually works, but were too afraid to ask? One of the best ways to get that knowledge is to sit down and build one, from scratch. In this workshop, we'll do exactly that: starting from "File|New", we'll build a working interpreter for a relatively simplistic virtual machine, and along the way, learn a great deal about how VMs work in general. But be warned! Learning this material could have the unexpected side effects, like great appreciation for other virtual machines and the start of a lifelong obsession.