I would only bring one thing: my easy button! I would push it and change the world-destroying problem into something on the level of a grade school bully. I would then spend the rest of the day and the next two days as I normally would.
So you consider your girlfriend a tool eh? poor girl
also I've changed my mind I don't want the neuralizer anymore I'd much rather have something more useful like a regular phillips head screwdriver or rather a flathead just in case I run into both if I run into any special screws then...I'm screwed