N1-5L: Rocket lifts off, engine explodes, control system shuts down all but one engine, rocket falls back and destroys launchpad.
Cygnus Orb-3: Rocket lifts off, something explodes near bottom of rocket, rocket falls back and seems to have caused severe damage to the launch pad.
Which isn't flattering for Orbital is that the Soviets in 1970 had no computer simulations available for the N1, and couldn't even afford to build proper test rigs.