The fear gnaws at your gut like a hungry parasite, and you consider turning and running, but to do so would bring suspension, or perhaps even expulsion. You can't afford that. So you press on. How bad can it be, really? Just go in and get it over with. An hour from now you'll be back in your dorm, with a clean slate.
And then you round the corner, and the door is suddenly there in your face:
Finally, the sharp clapping ceases, and you breathe a sigh of relief. Not a minute passes, however, when a new sound assaults your ears, a Thwisshh, followed by a squeal.
The pair of sounds repeat.