If you were cold then you would catch a cold.
There is a startling amount of people here (most people I know) that believe this. I work in healthcare and we constantly have arguments about the AC in summer for that exact reason. Yeah cold weather can make it easier to catch a cold but it's interesting to see how many people believe that you need to get warm to avoid catching a cold.
Carrots will allow me to see in the dark if I eat enough of them.
Partially true. If you're vitamin A deficient, your night vision worsens and carrots can help with that. But you won't get Minecraft night vision