What are some examples of 'common sense' which are nonsense?

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Ah, I didn't realize the moon could look bigger/smaller at different times. I thought you were saying that the moon is actually the same size as the sun or something like that.

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I like to try and combine these to see what kind of reactions I get.
The cream rises to who you know.
The squeaky wheel gets hammered down.
He who laughs last, comes around.
Great minds killed the cat!

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Common sense isn't just "not so common," it is a fundamentally broken concept at its core and a crutch that people use to hoist themselves above others they feel they are better than.

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To tilt your head back if you have a blood nose.

This is no longer recommended advice, because you end up drinking the blood which causes vomiting.

Probably initially said by someone concerned about their carpet.

Way to stop them is put ice over the back of neck, plug nose with tissue and clear clots each 2 mins.

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My favourite explanation of the Monty hall problem is that you probably picked the wrong door as your first choice (because there’s 2/3 chance of it being wrong). Therefore once the third door is removed and you’re given the option to switch you should, because assuming you did pick the wrong door first then the other door has to be the right one

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and even if there is a reasonable option, they probably won’t win the vote anyway.

See, this is it right here. Anyone can run, but nobody can win without being slick and two-faced. The idiot vote is the largest block. If you get involved it'll be obvious pretty fast.

(I say usually, because a few elections are better than other, but generally speaking at a federal level, it’s slime no matter how you vote)

So, you're assuming we're all American here. This applies to every democracy, including my own. In America, add a probably terminal deadlock problem in on top of that.

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Exactly. I feel like just listing them out is of limited use because of that.

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"There's a first time for everything."

No, not if I don't do that thing. I will not have a first time for murder. Getting murdered might be out of my control, but I won't commit one.

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Cold Air will make you sick.

There are plenty of studies debunking it, and yet I still hear about it all the time.

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It's extremely useful, because it's an index to all the known things that might be useful in a given situation. The point is not to assess all of them, the point is to not miss ones you're unfamiliar with that may be important in your situation.

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Thanks for the help, it was easier this time

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Is the goal to point out contradictions in the pairs you gave?

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I've been hearing it for years, always argued against it.

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If "common sense is not very common", why is it called common sense?

Slightly off topic, sorry.

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Flagging everything is as good as flagging nothing, though.

I imagine psychologists can do more with it, but in practice the main thing I see formal fallacies use for is as something to shout during a debate, and it never seems to convince anyone.

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Don’t eat snow to rehydrate yourself. It will only make you freeze to death faster. Melt the snow outside of your body first.

Wait, how does that work? It seems like it should take the same energy to melt it either way.

Also, do people not know every berry isn't edible? Even here where not a lot grows, there's plenty of decorative ones around that will give you the violent shits.

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When people say that, they mean they're so much smarter than everyone else they could fix it all in a moment.

Of course, in reality, the cranky old man saying that has just stayed so uninformed about the issues he doesn't know what he doesn't know.

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This is a common argument in our house.

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My explanation is better:

There's three doors, of which one is the winner.

First, pick a door to exclude. You have a 66% chance of correctly excluding a non-winning door.

Next, Monty excludes a non- winning door with certainty.

Finally, open the remaining door and take the prize!

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but nobody can win without being slick and two-faced

And don't forget 'rich', or more importantly, supported by the rich. A national-scale campaign requires resources that a typical organization can't gather, and to win without such a campaign is miraculous in most systems.

So, you’re assuming we’re all American here.

Nah, like you said it applies to most democracies, even if America is an extreme example of these universal trends.

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What are some examples of 'common sense' which are nonsense?