I was in an emergency evacuation once: the chemistry floor upstairs had a fire but we didn't know that when the alarms went off. We put our experiments on pause (thinking we would soon be allowed back in) and people filed out. My office was nearby so I grabbed my jacket and bag on the way out as well as a coworker's jacket. It was cold and damp outside so we were glad we had our jackets. We were not allowed back in the building until the next day. I was very glad I took my things with me during the evacuation.