What Floats in Water Coffee or Tea mug - Monty Python and the Holy Grail

The answer to this question is useful to know when determining whether someone is a witch, regardless of whether you have previously been turned into a newt. And should you happen to be a fan of all things Monty Python, please clicketh below: Technicam notitia (the technical bits) Mug holds 11oz / 325ml of your favorite hot or cold beverage.  White exterior and interior. Lead free. Dishwasher and microwave safe. Our lawyer requires us to notify you that if you fill this mug with a hot beverage, the contents may be hot.  We really need to get a better lawyer.