Today at work we were supposed to have had a 3 minute silence at 11:00 for those in Madrid. Usually on these occasions, there is a short blast on the fire alarm to mark the start and end of the silence.
Today, however, the fire alarm monitor left the bells running for the whole period, so it kind of spoiled the "silence" aspect. As did 800 people legging it out to the car park thinking the place was on fire.