I can just imagine the conversation now:
Neil: "Hey there Buzz, have you got the flag?"
Buzz: "I thought you had the flag"
Neil: "Don't screw with me Buzz, you told me you had the flag"
Buzz: "No, you said you had it. I'm sure. If only CCTV had been invented before we tried to get to the moon. That'd show you"
Neil: "Buzz, I hate to tell you this, but we're gonna have to turn back"
Buzz: "But we;ve just burned through the Earth's atmosphere. Turning back now would be too dangerous"
Neil: "I don't care Buzz. I've been keeping that flag safe all my life. Everyone telling me It's not worth having a flag, unless you're gonna go. Well Buzz we're going and I damned if I'm getting there without my flag!"
Buzz: "Roger that"...
....
....
*Upon re-entering the Earth's atmosphere*
Buzz: "Neil? What if we get back and markoasis has taken the flag to Dulwich?"
Transcripts from the Apollo 11 spacecraft