This is a perfect one for Friday night.

Charlie Rose had the former president of the Soviet Union Mikhail Gorbachev and President Reagan's Secretary of State George Shultz on his program this past Tuesday night. This year marks the 20th anniversary of the fall of the Berlin Wall.

Gorbachev got a laugh when he said he wasn't all that impressed with Reagan's historic challenge to "tear down this wall". But went on to say that he believed Reagan "was a great president."

Shultz was talking about the Lake Geneva summit and mentioned the two leaders ducked out of a meeting to take a walk to a nearby cabin.

"I wasn't there...," Shultz said before Gorbachev cut him off.

"From the fireside house, President Reagan suddenly said to me, 'What would you do if the United States were suddenly attacked by someone from outer space? Would you help us?'

"I said, 'No doubt about it.'"

"He said, 'We too.'"

"So that's interesting," Gorbachev said to much laughter.

He then said to Shultz, "I'm sorry for having interrupted you, but it was an interesting moment."

Rose concurred.

Scroll down to watch the video.

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