Worst:
Working on a C# project that took ages (to the point it burnt me out) not long after dealing with a relatively simple static site project that ended up incomplete because one of the team members couldn't be arsed in providing the info needed.

Best:
Working on a project where I get to put my UI/UX, software architecture and fullstack dev skills to the test on a problem I have may benefit others, as I started a new job that pays well.