Rockets Always Blow Up

Koyaanisqatsi - Ending Scene (Best Quality)
RikkiiZ

Cool rocket footage with cool music.

From Wikipedia article:

Koyaanisqatsi is a 1982 American non-narrative documentary film directed and produced by Godfrey Reggio, featuring music composed by Philip Glass and cinematography by Ron Fricke. The film consists primarily of slow motion and time-lapse footage (some of it in reverse) of cities and many natural landscapes across the United States. The visual tone poem contains neither dialogue nor a vocalized narration: its tone is set by the juxtaposition of images and music. Reggio explained the lack of dialogue by stating "it's not for lack of love of the language that these films have no words. It's because, from my point of view, our language is in a state of vast humiliation. It no longer describes the world in which we live." In the Hopi language, the word koyaanisqatsi means "life out of balance".

Is that a Saturn 5 rocket taking off? Yes and no. 22over7aintpi explains in a comment:

In case you were wondering there are two rockets featured in this sequence. The first is a Saturn V on the launch pad, the second is the first Atlas-Centaur Missile launched on May 8, 1962. No one was hurt in that explosion and clues to why it exploded are a flapping liquid nitrogen line by the vernier engine and the venting liquid hydrogen some seconds into flight. The failure was determined to be caused by an insulation panel that ripped off the Centaur during ascent, resulting in a surge in tank pressure when the LH2 overheated. Beginning at T+44 seconds, the pneumatic system responded by venting propellant to reduce pressure levels, but eventually, they exceeded the LH2 tank's structural strength. At T+54 seconds, the Centaur experienced total structural breakup and loss of telemetry, the LOX tank rupturing and producing an explosion as it mixed with the hydrogen cloud. Two seconds later, flying debris ruptured the Atlas's LOX tank followed by complete destruction of the launch vehicle. The panel had been meant to jettison at 49 miles (80 km) up when the air was thinner, but the mechanism holding it in place was designed inadequately, leading to premature separation. The insulation panels had already been suspected during Centaur development of being a potential problem area, and the possibility of an LH2 tank rupture was considered as a failure scenario. Testing was suspended while efforts were made to correct the Centaur's design flaws.

Title from The Right Stuff.

As for the quotes at the end, sounds kind of like my theory of dragons:

I prefer to think the dragon legends come down to us from a previous civilization that had mechanized, flying war machines like the A-10 Warthog. After that civilization collapsed and the art of heavier-than-air aircraft was lost, how would you explain something like an A-10 to your kids? "There were fire breathing monsters that flew through the air and destroyed everything in their path". That's how.

I like Graham Hancock, the guy who's always postulating the existence of an advanced human civilization a zillion years ago, except I just now had a thought. What if this advanced civilization actually created humans from the biological material at hand (like all the existing plants and animals)? Created us as an experiment, and when the experiment started to get out of hand, they bailed out. Kind of like the archetypal mad scientist in horror movies. He brews up some mystical stew in a large pot and it reacts too well, starts bubbling over and eventually expands to take over his lab, the building and the town. Yeah, at this point the mad scientist bails out and I suspect a similar scenario prompted our createors to bail out as well. 

It is doubtful we would ever find any evidence of such a civilization on account of the ice age glaciers that ground everything to dust. And if we ever did find any evidence, I doubt whether we would recognize it, much less understand it.