What was the most spectacular event seen by human eye in the Solar System?

In 1994, the most spectacular event ever seen by human eye in the Solar System happened -- a newly discovered comet struck the planet Jupiter. The comet had been shattered by Jupiter's gravity in 1992, and the fragments were now in orbit around the planet. Between July 16 and 23, 1994, Jupiter was struck by a string of fragments with an average diameter of 1 to 2 km. The impact of the largest fragment was about 600 times more powerful than all the world's nuclear weapons!