Well, I don't know if this is surprising or not, but I discovered an interesting way to make Apache crash on a Windows box at least.
I was working on my user authentication module when in a stroke of pure the-opposite-of-genius, I decided to try an instantiate a child class of my auth class from within the auth class itself. In my defense, the child was originally stand alone, until I decided I needed properties of the auth object to help it do its job.
Nevertheless, no exceptions were thrown, no Warning!Warning!Warning! danger will robinson, no nothing. Apache just kicks the bucket when you try to do that.
Spiffy. I'm glad I figured out what I was doing before I finished this post though, because originally I was blaming it on changing my && operator to an ||, which it soon dawned on me validated the expression as true, which called the class, which killed Apache.