That was no slip up, for sure. He simply couldn't lie to to that little girls face and he stumbled through his words thinking about the consequences they may carry.

502 Bad Gateway

Sounds like a Joe Biden answer.

In the documentary American Moon they also talk about the “Moonrock” Buzz Aldrin and Neil Armstrong donated to a museum in Europe that, after being forensically investigated a decade later, turned out to be just petrified wood from earth.

Edit: here’s the link https://www.telegraph.co.uk/news/science/space/6105902/Moon-rock-given-to-Holland-by-Neil-Armstrong-and-Buzz-Aldrin-is-fake.html