What Crime Would You Be Charged For Shooting Someone With A Beam That Makes Them Forget What They Were Doing?

Assuming it's the US. Is it even illegal? I'm thinking if we had a real life Doofenshmirtz, it'd be hard to charge him with a crime for half the stuff he does. It's surely not a crime to shoot someone with a beam, most beams (laser pointers) do nothing if they don't hit your eye. You'd obviously be liable if they crashed their car or something, but if nothing happened is the act of hitting them with a forget beam a crime?