This gem from Wiki Wiki Web:

Customer: We Want It We Don't Want It

Departing Programmer: I did it my way

Customer: We Want It We Don't Want It We Want It

Departing Programmer: I did it my way

Customer: We Don't Want It We Want It We Don't Want It

Departing Programmer: I did it my way

Customer: We Want It We Don't Want It

Departing Programmer: I did it my way

Customer: We Want It We Don't Want It ...

Repeat, ad infinitum.

The worst case is that each of these programmers implements half of their giant superstructure according to their tastes during their time on the project. The 3rd programmer sees a confused muddle.

Best case is they each...

— Do The Simplest Thing That Could Possibly Work