A coworker brought in cupcakes and said "I'm sorry you can't have any on your program because they're made with mayonaisse."
Side note - I work for a large pharma company in the diabetes/insulin department and at least three days a week there are sugary treats 10 feet from my desk. At our health fair the juvenile diabetes table was covered in candy and I finally had to say something! They said "well it's sugar free". I said that wouldn't really make it better ... But it's actually NOT even sugar free.