With Honors (1994)

Monty is a student, and when his computer crashes, he's left with only a single paper copy of his thesis. Frightened of losing it, he immediately rushes out to photocopy it, only to stumble and drop it down a grate. Searching the basement of the building, he discovers that it has been found by Simon, a squatter. Simon makes a deal with Monty: for every day's accomodation and food that Monty gives him, he will give a page of the thesis in return.