It seems a Russian Proton-M rocket carrying three Glonass navigation system satellites suffered a catastrophic failure immediately after launch last year in Kazakhstan. The resulting explosion, shown below from several miles away, was . . . impressive, to say the least.
I hope all that flying glass didn't hurt anyone!
Here are two more views of the same explosion, from a nearby road and from launch pad cameras.
I'm glad I wasn't near that one . . . and very glad it missed the residential area in which the first video was filmed. I'd imagine that explosion was big enough to wipe out most of a typical town.
(A tip o' the hat to Foxtrot Alpha for the links to the videos.)