A while ago either here or over at the old place, there was a FPH story about a guy whose girlfriend would get really sick if she ate too much fat.  They were eating lunch with two lard barges who switched the poor girl's non-fat salad dressing for full-on fat dressing, thinking that the girl was too thin and the fat would be good for her.  The girl got really sick and had to rush to the bathroom.  Then the guy figured out what happened.  He should win an award for self-restraint, as I probably would have beaten them to death with my bare hands.