Saying bless you after someone sneezes is, as people have pointed out, because sneezing was the first outward sign of the plague, and they were trying to get God to help you out.
The one about being possessed by the devil is having to put your hand over your mouth when you yawn. Because you can't stop opening your mouth when you yawn, people thought the (invisible) devil was forcing it open to get inside for a bit of possessing. Covering you mouth would stop him. In the middle ages that is.
King_Cnut 615 posts
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