The look-at-you-as-though-(whatever) technique must be taught in Medical schools to deal with people who have questions you don't have a really good answer for.
Mrs. LantzALot tried for years to convince her daughters that indiscriminate injections were not good. and met with that look. When something actually happened to one of ours (see post 9, above,) she was able to get some information from a former talk show host to help get her daughter some compensation. Even though there is a government program established to handle just such goofs, it is still almost impossible to get anything.
I've always preferred "Do you have any idea what a Louisville Slugger tastes like?" as the answer to that look.