There's an explanation for this one. I scratched my arm a little bit, so I put a band-aid on it. An hour or so later, it felt weird, so I removed the band-aid. Turns out, I had developed an allergy to the adhesive in band-aids. My entire forearm was now covered in a bright red, painfully blistered rash oozing yellow fluid. And since I couldn't put a band-aid on that, I had to wrap gauze all the way around my arm. It took eight months to heal, and still recurs a little bit occasionally. So that's why I wanted the time machine. I just wanted to stop Past Jenn Bean from applying that band-aid. I wouldn't use it to step on butterflies and alter the course of the universe or anything.