Do witches float in water because they are clairbuoyant ?

Son of a witch, that's a tricky question.

Maybe the foods they eat makes them floatulent.

Actually, if you survived this torture, you would have been accused of being a witch and more than likely have been publicly executed. 

It was thought witches had rejected the rites of baptism, so running water would have rejected them. Same test for suspected wizards and magicians. See lore on how vampires allegedly can't cross running water. There's all kinds of weird stuff out there.

"As part of the infamous “swimming test,” accused witches were dragged to the nearest body of water, stripped to their undergarments, bound and then tossed in to to see if they would sink or float. Since witches were believed to have spurned the sacrament of baptism, it was thought that the water would reject their body and prevent them from submerging. According to this logic, an innocent person would sink like a stone, but a witch would simply bob on the surface. The victim typically had a rope tied around their waist so they could be pulled from the water if they sank, but it wasn’t unusual for accidental drowning deaths to occur." https://www.history.com/news/7-bizarre-witch-trial...

Everyone knows witches are made of wood.

https://www.youtube.com/watch?v=yp_l5ntikaU

no, because they weigh the same as a duck.

lmfao i dont think so XD