It probably seemed like a good idea at the time to get PUGLIFE tattooed across your forehead, but it might put a damper on your idyllic college dreams. Colleges aren't likely to go trawling through your social media posts for hints about your life, but any information they happen across while researching your accomplishments might color their impression of you (source). 

Similarly, those who have been convicted of a crime face a tougher road to admissions success (source). It's not impossible to be a student with a checkered past, though. For instance, Hogwarts graduated boatloads of rough customers and they're still in business.