If your application accepts input from users you’re likely going to want to perform some validation on that input. If you allow users to create data within your system that is displayed to other users (i.e. it should be “human-readable”) you might consider implementing a validation routine that ensures that all input for this data consist only of letters and whitespace. While I generally tend to shy away from overly aggressive validation of user input, I think that this kind of validation can make...