I agree with mightaswelllive on this one. Passive-aggressive anonymous notes and Beano are just hurtful. My sister has very severe GI problems that are the result of cancer. No amount of Beano or avoiding certain foods is going to solve that problem. Many GI problems are beyond those simple solutions. You may want this person to "laugh" about their problem, but it very well may not be a laughing matter to them. At least have the respect to ask them directly about the problem. Maybe you'll get a straight answer by simply being kind, concerned, and honest. Hopefully it isn't a major illness this person is dealing with and just bringing it to their attention will be all it will take, but do it respectfully.