Remus glanced at Sirius, not entirely certain what had gotten into his best friend, but there wasn't time to figure it out. "That spell will amplify your voice," he explained to the green man. Since Sirius didn't seem willing to do so and they hardly needed to antagonize him more. "There are others that can be used to amplify the sounds that your robot creates. And Padfoot, explain what you're casting BEFORE casting the spell on the Muggles? It's only polite."

It was against every single Statute of Secrecy currently on the books at the Ministry of Magic, but that was what memory charms were for.