Witches and very small rocks

So friends you know in "The Holy Grail" how during the "trial" of the "witch", they try and weigh her and also see if she floats. Well we went to an Torture Museum in Cartegena and in fact those are real things they used to do to see if a person was a witch or just strange. Inside the museum they had a scale for witches, and if the person was lighter tan they expected then it meant they could fly and in that vein of logic then they were with out a doubt a witch. Humor and truth, a sad mix.