Cry ‘Havoc!’, and let slip the dogs of war…
“We forgot the flag? Really?!” 
So, on a serious note, if an astronaut were supposed to say something scripted, official and dignified upon setting foot on Mars, but instead deliberately went with something utterly unacceptable like “Fuck your tits!”, would NASA actually be faithful to the facts and publish the script truthfully for what it was, or would they immediately go into gag-order mode and doctor the transcripts and audio for public release and historical posterity?
Just like the lunar landings, the USA and NASA won’t be the only ones listening in
“Just think how much faster we would have gotten here if we used a decent packing tape gun.”
My thought as well, not quite those words, but you get a ‘like’ from me. 
“Who says there’s no life on Mars?!?”
Whatever they say, I really want them to do it in Marvin Martians’ voice.