The phrase on the T-shirt is a humorous play on the idea that people who talk to themselves are crazy. The T-shirt is a way for people to poke fun at themselves and their own inner critic. It is also a way for people to show that they are comfortable with who they are, even if they are a little bit quirky. The T-shirt is popular with people of all ages and genders. It is a great conversation starter and is sure to get you a few laughs.