When you're in a service job you get asked every god damn shift. Sometimes, you'll get the exact same phrasing of the question from multiple people on the same day and then it'll really drive you crazy. Depending on whether they've paid or not, how nice they are/whether they have tattoos or not, how busy I am, and how nice I'm feeling, my response can vary greatly.
One of my favorite responses when I don't wanna deal with people is to tell them some super depressing story about a tattoo and watch their face drop. Then I just walk away to another table :D