This one squeeked by at about 1/5th of a lunar distance – something like 50,000km. The rock was a small 25m in diameter but by my observation, probably miss-shapen as it was quite variable in brightness which suggests it was happily tumbling in space.

It was only 14 degrees above the horizon so the quality of the video is quite poor and I had to use half second exposures to see it properly, and there was only a very short window of opportunity to see it at all from my site.