[EricH]

Originally Posted by Karibou

I've never watched Monty Python, so whatever reference was made just flew over my head at the speed of light.

Short version (for those that haven't watched):

King Arthur is recruiting for the Round Table, and stops by a village where a woman is accused of being a witch. The local officer for the job requests proof. ("She turned me into a newt!" "A newt?" "I got better." and "Well, we did do the nose." are some memorable lines here...) Anyway, he asks, "What do you do with witches?" to which the crowd answers, "Burn them!" "What else do you burn?" "Wood." This leads to a logical chain leading to the conclusion that the accused must be a witch if she weighs the same as a (rather large) duck. They use the largest scales in town for the job.