jig saw or small plasma either one should work well. King of Random has some other cool projects, ya know, if you're into the whole heavy metal, backyard arc reactor, dry ice explosions and sugar motor rockets type stuff.
For Mikey. Wield the deadliest weapon in the entire utility belt when you start carrying around the Batman batarang knife. Equipped with dual three inch stainless steel blades, the knife takes a familiar bat shape and provides twice the cutting power once extended.
Batman Batarang prop replica from Quantum Mechanix