When he twists the tap, a section of the bar top slides forward to expose a terminal! It is a foot wide and looks like it can be removed from its holder. But the screen starts to glow white, then changes to show a field of stars. But that soon turns black with when simple white letters appear that read:

"To access this terminal, your choice is a simple one: A or B.

"Answer correctly, and you may proceed.

"Answer incorrectly, and you may not live long enough to regret it."

Then two buttons appear onscreen, one with a bright A on it and a B on the other. Both wait patiently for a decision to be made.