Apollo 13/Funny

When Jim Lovell's mother Blanche is at the Lovell home, Marilyn has two men to keep her company while watching news coverage. Who are those two men? Neil Armstrong and Buzz Aldrin. Upon meeting them, she asks "Are you boys in the space program too?".
When the doctor at Mission Control begins to freak out when Lovell's bio readings flatline, followed by Haise and Swigert (they just removed their sensors in a fit of cabin fever).

"I am sick and tired of the entire Western world knowing how my kidneys are functioning!!"

As the crew begins to prep for its re-entry, we briefly glimpse a piece of paper over a panel in the cockpit, simply marked "NO!". When all three men get back in the cockpit, Jim asks Jack about the note; Jack admits that he was getting punchy during the CO2 incident and didn't want to accidentally jettison the LEM with the other two men still inside. (This happened for real on the actual Apollo 13. The note part, not the jettisoning the LM part)

Lovell: (deadpan) "That's good thinking."

Kranz's reaction on learning they only have square carbon dioxide scrubbers for a round filter:

"Tell me this isn't a government operation."

When Ken Mattingly first speaks to the crew after being grounded due to fears of getting measles:

Jim Lovell: Hello, Ken. Are the flowers blooming in Houston?
Ken Mattingly: That's a negative, Jim. I don't have the measles. (glares at the flight surgeon)

When Haise starts playing some rock-&-roll music instead of the theme from 2001: A Space Odyssey, I laughed and laughed.
"Get ready for a little jolt, fellas!" *BAM* *crunch*