In 1698 a British scholar came face-to-face with the unknown one foggy night while walking the dissolute cobble stone streets after hoisting one too many at the local pub. A malevolent fog bank already had him on edge when a sudden ‘POP’ to his rear spun him around ready to defend his honor. With fists raised, he found himself alone. The only proof that remained was the sudden awareness that the air lingering around him had become most foul.
This British scholar was Sir Charles Phart.
Keep your nose upwind. J/W