Houston, We've Got a Poop Problem

Houston, we have a problem! There's a turd floating in space.

In 1969, during the Apollo 10 moon mission something went awry. In this declassified log of the fourth manned mission to the Moon, astronauts Thomas P. Stafford, John W. Young, and Eugene A. Cernan had to deal with some, um, toilet malfunctions that resulted in UFO (Unidentified Fecal Object) floating in zero G in the spaceship.

It was humanity's first close encounter of the turd kind. (On a side note: we now learn that astronauts curse. A lot.)