OPEN SESAME!
The Doctor grimaced and clutched the wire. This was it then. All he needed to do was touch these two wires together and the vault doors would open. And, in keeping with tradition, inside there would be all manner of armed guards, flesh-eating monsters, mind-eradicating psychic weaponry…
He bit his lip, brushed a clump of wet curls from his face, rubbed his cat brooch, and touched the wires together.
The vault door silently slid open.
Nothing else happened. No guards. No monsters. No soul destroying traps. Not even a nice loud alarm klaxon.
"Oh." The Doctor said, sounding rather disappointed.