The mathematical trauma is real with this one. After weeks of integration problems, your brain gets so conditioned that you start seeing constants of integration in your sleep. That "+C" becomes like an old friend you can't stop texting. The struggle not to automatically slap it onto every equation is like trying not to think about elephants once someone mentions elephants. Now you're thinking about elephants AND integration constants. You're welcome.
For the uninitiated: when solving indefinite integrals, you must add a constant "+C" to represent all possible solutions. Skip this step on an exam and watch your professor's soul leave their body.