OK, I have to admit, this is weak. But, if you want to learn how to create an infinite loop, with one word, this is it. Route.
I happened upon this maybe 5-6 years ago, when we ended up having to set static routes on computers because of some goofy office politics, but anyways..
Create a batch file. Name it route.bat. Edit it, type in the word route. save, exit, and run it. Infinite loop.
Fun stuff. Not bad for an after the bar exercise..