Invisibility Cloak

If I could be invisible that would be a bit crazy. First of all I'd like go to WalMart and run around screaming like a retard and nobody would know where it was coming from. I'd manipulate objects and make fun of so many things and just have fun with it. The advantage of it would just being able to do things and nobody able to get you into trouble for it. Disadvantage would be that lets say it was permanent then people that you would want to see you would never be able to.