My friend made the mistake of accepting the extra credit offer. The following weekend, the students discovered they had to skin and stuff about two dozen skunks.
You could smell the mammalogy lab outside the life science building. It was incredible. But, fortunately for the students working in said lab, the human olfactory system will totally shut down under such overwhelming situations of stench.
The de-scentsitized students worked through the afternoon into the evening and night. Sometime after midnight, all the skunks were done. The students were hungry. Someone said, "Hey, let's go to Denny's! It'll still be open."
The Denny's was indeed open. It even had a dozen people in it ... but not for long. The moment the unwitting lab workers entered, reeking of rotting skunks, everyone in the place dropped money on their tables and fled for their cars.
I heard they gave the unlucky waitress who had to serve them a nice tip, though.