I had an instantaneous light off on a 744 once and tail pipe fire, easy enough to deal with, fuel off continue to motor etc.
We also had a tailpipe fire on a 747 classic once (not me) because of a communication problem (english crew, chineese ground crew) the crew dealt with it incorrectly, unfortunately by the time the crew realised what it actually was, wires had been burnt through and they were unable to shut the engine down/put out the fire from the cockpit, lots of damage, fortunately no-one hurt.
I can't actually view the video (youtube banned here!) so can't comment on it, in the good old days used to get a bit of a flame on the JT9 on strating but not much to worry about.