"Professor, what are you doing there?" the security guard asked. The man on the dungeon floor of Warwick Castle looked up. Off came the headphones connected to the box of pulsating lights.
"Fair cop,"Prof Tutti said. "But remember my success at detecting Death Watch beetles using Sound Technology, well this is a modified pack set for a trial run."
The guard paused; smiled. "Fascinating stuff," he replied. "Tell me more. Surely there aren't any DeathWatch beetles in the concrete below us? So what are you after?"
"OK .You listen."
" Yes. Vampires. They like to click their teeth."
Cleveland W. Gibson