I had this happen a few years ago. First day in a newly renovated part of the office. We had been told that there might be testing going on on the alarm system

I had this happen a few years ago. First day in a newly renovated part of the office. We had been told that there might be testing going on on the alarm system and that it might go off. Alarm starts going off and no one pays much attention until the smoke starts pouring through the hallways. A few offices didn't have a good view of the smoke and at least one of my co-workers stayed in the building for a good 15-20 minutes after everyone else left. No one injured, fortunately!