Imagine a booming voice coming out of some office intercom system (that you were, up to this point, totally and blissfully unaware of) saying, repeatedly:
"Attention tenants, attention tenants. Please disregard any alarms, sirens, strobe lights, or smells you may notice in the building."
Sirens? Smells? I peek around my office and no one else has even looked up. Such is New York.