I run into ignorance quite a bit in the medical field. Not as often as some of the industries mentioned here (thank God), but enough to be irritating. My personal favorite are the 50 year old diabetics who are coming in for a second amputation, have their family sneak in KFC nightly, and blame us for jacking up their insulin requirements. They'd literally prefer to have pieces of their body carved off each year, than to amend their lifestyle. Oh yeah, and they're all Medicaid too, so you and I are paying for it.