[jszymborski]

Unless you've a nozzle on your knob, you won't achieve the laminar flow required to have an uninterrupted stream to carry the electricity from electrode to knob.

QED via Mythbusters

[plug]

Interesting. Would that depend on how close you were to the source?

Either way, I assume - crucially for the shop owner - most backed-up, drunken revellers would be unaware of this :)