Sirius gave a start and nearly unbalanced his chair as he gawked at the levitating cup. He quickly grabbed hold of it, slammed it down onto the table, and winced as several people turned to look at him.
"How the hell did you do that?" he hissed under his breath, trying to make sure only Tonks could hear him. "Shit like that's no possible unless you're Cris Angel or something."