Clearly, then I need to make awfully sure it's actually God and not a hallucination. I would probably not do it because in that case I know that the undergrad does have a sick sense of humor and I shouldn't listen to him because we're all screwed anyway.
Now, if you're going to bring up Abraham and Isaac or something like that, remember that in this case Abraham was pretty darn sure it was actually God talking.
So this sort of response indicates that you are distinguishing between "God" and the 11-dimensional undergrad as distinct ideas. In that case, a generic creator argument isn't very strong evidence since there are a lot of options for entities that created the universe that aren't God.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.