People always came late and left early at my school. I thought this happened at most schools. I usually came and left on time, but I was the queen of bathroom and drinking fountain breaks.
I loved the privelege of not having to ask the instructor everytime I wanted/needed to leave the room, unlike in high school.
People would eat in class too...I had everything from McDonald's to pizza to ice cream. I even had classmates who brought in chinese food and stinky fish sandwiches. It was soooo distracting.