When I was a student I spent one summer temping for Coral Gas, refilling the bottles. It was all done in the open air for obvious reasons. (Must have been a terrible job in winter) anyway one day a you lad driving a fork lift (who shouldn't have been) went down a slight slope forwards (should have gone backwards) the bottles fell off and one valve came off. One of the guys hit the emergency button and all hell let loose. The suppression system around the massive storage tank kicked in and that was engulfed in a cloud of inert gas or water vapour and people were running everywhere. The funniest thing was seeing the girls sprinting from the office. Most fire drills I see people are so slow to get out of the office, not on this occasion.