
The Business end of the soviet N1 rocket. The N1 was the competitive program to the Apollo program, and each one of those is Saturn sized.
Their (unmanned of course) launch history is:
First one: Exploded 69 seconds after lift off.
Second one: Exploded 23 seconds after engine started, and took the entire launch tower with it.
Third one: Went of course, it had to be exploded 51 seconds after lift off.
Fourth one: First the engines shut down 106 seconds after lift off. Then it exploded.
So yes, there were a few kinks to work out...