As the fifteen candles were slowly extinguished the building became steadily more dark - aided by the electric dimmer lights that weren't available five years ago. As the building plunged into darkness we heard a solid (single) bang representing the closing of the tomb...
The atmosphere at the end was suitably sombre and everyone left quietly...
You don't need to be jolly to be meaningful - sometimes you have to go right down into darkness - and stay there for a while...
I have to say I'm not keen on worship that is simply sombre for the sake of it - all these people walking round with serious faces - but sometimes you have to do misery properly - and that's what tennebrae is all about....
The flip side, of course, is that having dwelt on death, depression and failure you must also take resurrection seriously as well - you need both Good Friday and Easter Sunday.