Black Plague is said to have killed 1/3 of the European population in the years 1328-1351. One of the silliest remedy was not to breathe, seriously.

Molasses is not something you would like to eat everyday; what about eating old, and spoiled molasses? Cause people thought that was a cure.

After some time people realized that The Plague is airborne and said the bad air from the sewers won't let the fresh but deadly air in. Living in the sewers didn't work though.

LEECHES! People used leeches to get rid of "bad blood"... rich people that is. Poor people had their veins opened by a filthy knife, and most of the times died from infections.

Eating crushed emeralds. Don't know how this was supposed to work, but it's said to hurt like eating glass... no sh*t.

Another way was not bathing or "cleaning" your body with urine. It wasn't any urine but urine of a healthy person.

Somepeople went further and used a paste made of roots and feces on wounds, what a sh*tty way to die.

And we go to this one- strapping a roosted to a place swollen from the Plague, it continued until one of them, rooster or the patient, died.