If you know you're going be late for a lecture, don't come at all. I mean seriously... the fact that you can't manage time and come in on time probably means you wont even comprehend what's going on in the lecture.
Not only do you let the door slam behind you, you seem to have have a pair of chav shoes which make sounds like they have in-built speakers.
You then sit down, slamming chairs as you go by finding somewhere to slouch and finally fall asleep.