Actually, I rather like this one from the other point of view. Like a lot of the technical aspects of Apollo, when you bring up the geological samples to the credulous laymen they often respond with the idea that geologists wouldn't know the difference; that someone had to tell them the rocks came from the Moon, they hadn't seen that exact rock before so they shrug and agree.
In this case, as I have heard the story, a geologist was strolling through the museum on his day off, noticed the exhibit...and it took him literally seconds to realize something was off. By under a minute, he knew he was looking at something that could not possibly be from the Moon.
This is roughly what would happen if any of the hoaxies ludicrous ideas of trick photography or faked radio transmissions or made-up performance of rocket engines were to attempt to pass the real, working professionals out in the world.