Campus authority at Penn State can be strict. Pranks, illegal acts in the dorms, and more are taken very seriously, and the University will make an example of students who are caught. While the University police are rarely the source of student complaints, they're not known for being sympathetic. It's best to keep your on-campus nonsense quiet, or else move it downtown.
When it comes to general downtown rowdiness, most of the local police expect it and won't harass each and every drunken college student-they'd never get any sleep if they did. However, if you're caught being especially rowdy and too inebriated for your own good, you will be taken in. Being cited for underage drinking or providing to minors means a hefty fine and a required class about the dangers of alcohol. Although Penn State is a party school, this doesn't mean the students have free license to do whatever they want; the town does take public disturbances and lawbreaking very seriously, and police are constantly on patrol during the weekends and holidays.