If someone asks for advice on something, and someone replies with a humorous story about what they did in a similar situation. It may get more up-votes than any other answer, not because its good advice but because other people were amused by it.
This can lead to a false sense that this is the general consensus of what the appropriate action is, especially if the OP doesn't understand that the votes were for mere liking an answer rather than agreeing with it.
I don't have a great idea on how to solve this. My only idea is having 3 options for each category, up-vote for you agree its a good answer, down-vote for you think its a bad answer, or "like" which doesn't mean you think its a good or bad answer, you just were amused by it. This may over complicate the issue and create even more confusion, I am not sure. But I think it is a real issue I wanted to bring up.