What should you do if a group project member insists on changing the project to suit their own needs, like in your music festival story?

Why are American toilets more prone to leaks, and how does this impact maintenance compared to British toilets?
Have you ever regretted how you handled a rowdy or disrespectful situation on the job? What would you do differently?
How have you observed students' comfort with openly expressing their emotions evolve over your teaching career?