Let's do a thought experiment:

You're at a party. Maybe a holiday party. Maybe a birthday party for a friend.

You start chatting it up with someone you haven't met before, I mean, how bad can it be? You all got invited, right?

The conversation is going well. You share some interests. The drinks are really greasing the wheels.

And then he/she says that the Earth is flat.

All the sound stops for a minute as you try to digest what you just heard. You go back through the conversation in your mind, looking for signs that you were talking to a crazy person. You think of all the evidence we have that the Earth is, indeed, spherical. You start to realize that, if he/she thinks the Earth is flat, he/she probably thinks we didn't on the Moon. He/she probably thinks that Sasquatch walks among us, that Nessy is really good at hide and seek, that the positions of the planets should determine what he/she should order at Starbucks today.

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