A bit of history for you guys- 90 years ago today (December 6,1917), the largest explosion prior to the first test detonation of the atomic bomb during WWII decimated the city of Halifax, the capitol of my home province.
It happened when two ships, the Mont-Blanc and the Imo, collided in a harbor. A fire broke out and ignited the munitions that the Mont-Blanc was carrying. 2000 people were killed and over 9000 were injured along with massive property damage.
http://en.wikipedia.org/wiki/Halifax_Explosion
And here is a heritage commercial that I'm sure our Canadian members may have seen before.
http://youtube.com/watch?v=8oaRr6A-gkA