My favorite thing is to ask a gun nut to recite the 2nd Amendment. It’s one sentence:

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

They never know it. They usually kinda know it, but they never actually know how it’s written.

So I tell them that it’s this Marx quote:

Under no pretext should arms and ammunition be surrendered, any attempts to disarm the people must be stopped, by force if necessary.

And they believe me.