My College roommate had a friend as his partner in his circuits design class. His partner did less and less work on the group projects as the semester went on. On the final project my roommate did the whole project (And elevator control circuit with a little spinning disk). He was exhausted. They had to demo to the professor, who asked who did what on the project. "Dave did most of the work." "What did you do?" the prof asked.. "Actually Dave did all the work."" The friendship was salvaged, but the freeloader had to take the class again.