Here is a story on the CBC website about a Flourine gas spill at 601 Booth Street in Ottawa - a building I once worked at, home to the Geological Survey of Canada. The article is nothing remarkable, and I wasn't even considering posting it...
...Then I made the mistake of looking in the "comments" to the story.
Flourine and flouride are NOT the same thing!!!
Sorry, had to get that off my chest.