The expression is "witch's tit in a brass bra."   Now I myself can't be sure if the brass bra or the tit is the major factor, but I am willing to conduct experiments and take accurate measurements to determine the correct answer. If you can supply me with a number of young and nubile witches, I will provide the brass bra or something similar.

If you have specific witches in mind, please send me their pictures so I can ascertain if they are fit subjects for experimentation. Nude photos would be helpful.

Spaw