We were in a college group. Five people. Making project in PHP. Some forced us to use cakePHP framework than left. One guy decided to not participate and decited to do it next year. One guy didn't know PHP at all. The two of us have to do all the work for five people.

On the presentation day we have ten minutes to do it. Guy without PHP knowledge forget password for our app, make three wrong guesses and locked us out of our app for five minutes.