"That's exactly what it does. Among other things. All around, multi-functionally handy tool." The Doctor resumed scanning the glass, his sonic flashing blue and making a very odd whirring noise. "You enjoy your drink your way, and I'll enjoy it in mine. For me, this is fun. Don't tell me you've never been curious how this drink works?" He held the sonic up and interpreted the results. "Interesting."
He slipped his sonic into the inner breast pocket of his jacket so Lucifer wouldn't be able to grab it again, then sat back. "I know the music in here's loud, but am I going to have to keep repeating myself? Psychic Paper. It looks like a blank card but when you show it to somebody, it causes them to see printed there whatever is useful in a given situation. I've been able to flash identification and badges and invitations to elite parties."
He took a sip from the glass and savored the taste with a long, satisfying hum.