"What, the transformation wasn't enough for you? How do I know you're really an alien?" Sirius muttered. "Besides, I haven't even got my wand, so it'll be difficult to prove it to you. But I can give it a shot..."

He searched around for a stick, and placed it in front of him. "Wingardium Leviosa," he murmured, mimicking the wand movements with his hand. Wandless magic took an enormous amount of effort and concentration...but the stick was floating eventually.