Based on the context and the answer, generate a question. 

Context: Crowds of angry , smelly people were bitching and bumping into each other , and into me , trying to get their copy of whatever textbook they needed for whatever stupid class they were taking . One lady asked to herself out loud " Where is 237 ? " when she was looking at the History section of books .

Answer:

It was crowded , hot , and difficult to get their books .



Why may the people have been unhappy ?