Schmitt's rock hammer
Wow, a moment I am sure you will never forget.
In college, a favorite activity while in the field was a round of "Rock Hammer Golf", played like frisbee golf but with rock hammers. Lots of dangerous fun. I mention this 'cause Schmitt, the only real geologist to go to the moon, played at least one toss of Rock Hammer Golf. So it is not just footprints and fingerprints he left, his rock hammer is still there, on the surface of the moon.
For those that have not heard this story, here's the link.