When you notice someone about to sneeze and you somehow (distraction like saying "bless you" before they actually sneeze) force an incomplete sneeze that leaves the would-be sneezer with a feeling of frustrating non-consummation (as sneezing activates the same parts of the brain as an orgasm).
Is it mean to say "Bless you" before someone sneezes? No, everyone enjoys a good sneeze edging every now and again.
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