Yeah, I warn players not to metagame in general.
There is one adventure where there is a random encounter with an NPC. He seems to be important, and believes himself to be so, but in reality he is quite mad. He leads them around to areas in the dungeon that don't matter.
When the players first met him and they were deciding whether to follow him one player said "We don't want to take the game off the rails, lets follow him to get on with the plot."
They were awfully confused when the NPC was not helpful whatsoever. They learned a lesson about metagaming that day.
The best part of this story is the correct usage of "metagaming".
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