I wanna build a giant robot, with a flux capacitor powered by the corpses of jews left over from wwII. I'll connect the flux capacitor to a powerplant, and create a paradox in time that in turn gives me perpetual energy. With that perpetual energy I will light up a neon sign on the moon that says. "LOL I GUNNA NUKE U" And on the other side of the Earth I'll be there with my giant robot shooting nukes at you. Destroying everthing but Texas and Japan. But hey, dont try and blow up the moon cause I got my time machine up thur and I cant go back in time to get more jews. Therefore time itself will be destroyed on account of the time machine running out. Which would make everything that happened before gone. Meaning, if one of you right now decides to say "Hey Im gonna nuke the moon!" Well I hope your the first asshole to disappear from the universe unraveling.
Edit:In before Nouman