Timey-wimey detector

The timey-wimey detector was a makeshift device used for detecting temporal anomalies by the Doctor. He used it when he was trapped in 1969 by the Weeping Angels to detect others who had been sent backwards in time. It alerted the Doctor to an anomaly by dinging.

The timey-wimey detector had one main side-effect - it automatically boiled any eggs in a distance of thirty paces. Because of this, the Doctor learnt to stay away from chickens, as "it's not pretty when they blow". (DW: Blink)