Allergic To Perfume
Some people are extremely allergic to things like peanuts, which makes it impossible for anyone to bring a peanut butter sandwich to work. Other employees are allergic to perfume, which is exactly what one employee in this story had. But the person wearing the perfume refused to stop wearing it. Then HR got involved and forced the employee to stop wearing the specific fragrance. But reports came in that someone was continuously spraying the allergic employee's desk with the fragrance. And it was later discovered that another employee had brought in the same perfume... on purpose.