>snip
At about 12:30, with a sound described as a sort of muffled roar, the giant molasses tank came apart. It seemed to rise and then split, the rivets popping in a way that reminded many ex-soldiers of machine-gun fire. And then a wet, brown hell broke loose, flooding downtown Boston.
Spill a jar of kitchen molasses. Then imagine an estimated 14,000 tons of the thick, sticky fluid running wild. It left the ruptured tank in a choking brown wave, 15 feet high, wiping out everything that stood in its way. One steel section of the tank was hurled across Commercial Street, neatly knocking out one of the uprights supporting the El. An approaching train screeched to a stop just as the track ahead sagged into the onrushing molasses.
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http://www.mv.com/ipusers/arcade/molpark.htm