The Time Stop-O-Matic!

You pull the Time Stop-O-Matic from its shelf and hold it up to the light. It looks a lot like a bulky watch, so you should be able to wear it around without drawing too much attention. Best of all, it grants you the unfathomable power to stop time. It's a beautiful piece, and one of your favorites as it took you the longest to design and build. You slip it over your wrist. It makes your arm a bit heavier, but nothing you can't deal with. With a refreshed smile on your face, you head out onto the campus in search of your tormentor.