"That would explain why it's called an energy converter, then." Alan remarked, grinning at the Doctor's nod.

He blinked several times. Psychic energy was where he was about to start lagging behind somewhat.

"But... but that's practically criminal!" he yelped. "You telling me that if that thing beeps enough times, everyone's going to just keel over unconscious? What about people who are driving cars or buses? Or the airline pilots? People could get killed! Oh, God, Maria."

He pulled out his mobile and instantly started dialing Maria. If she and Chrissie were off driving somewhere back home...