Here's an awesome DIY project you can try out with an old Gameboy/GBC game that you're not too fond of -- turn it into a USB drive! Themadscientist101 has a photo guide showing how to cut open a window and shave off some of the inside wall to fit a USB drive into the plastic housing. You won't be able to play the game anymore after modding the cart, but if you use something crappy like Mortal Kombat, that shouldn't be a problem.
Just think of how cool everyone will think you are when you pull out a Pokemon cart to show off the Pokemon strategy guides you downloaded from GameFAQs! The girls will be fighting over you. It'll be like the Axe Effect, but in Pokemon form. For real.
Themadscientist101 also has a Lego USB mod that the ladies can't resist. Jump past the post break for photos of the brick drive.