Here's a whole heap of astronaut jokes.

Many of them are very dry or said in a deadpan manner. Here's one that's similar to the one about "visitors":

Apollo 17 - EVA-2 - Traverse to Station 3 - Alien tracks?
Spacecraft Films' Apollo 17 DVD No. 3 - EVA 2 - Traverse to Station 3 - 32:02
144:18:01 Schmitt: Hey! We crossed somebody's tracks!
144:18:07 Parker (over Gene): Hope they look like yours.