It seems (to me, anyway), that people who are downright AGAINST guns - ANY guns - seem to be not playing with a full-deck when just about anything related to guns comes up or happens.
This original post is a prime example of that. On one hand, the friend's girlfriend is against guns and against the OP from carrying into her home, yet she has the nerve to make a joke about the gun in question possibly being stolen! In my mind, the two don't go together. If she is so anti-gun then there should be no thoughts or actions on her part that would be, in any way, gun-related!
To not want a gun in her home is completely understandable, but then for her to carry it to the extreme of being stolen as an April Fool's Joke is no joking matter, no matter how one looks at it.
How would it have looked if, upon hanging up the phone, the OP called the police and summoned them to the scene! I wonder how that would all play out!
Making a false police report?
Fortunately he was notified in a timely manner that this was a joke. It could have ended a lot differently had the police become involved.