PHB: specifications??!!? We don't need no stinking specifications!
Me/you/anonymous programmer forced to work with said PHB (MYAPFWWSPHB): so we're supposed to work without a net, hu? Again, hu? You do remember last project and what you said could never happen again, right?
PHB: this time it's different! See? It's just a simple web app for just a few thousand users!!! What could possibly go wrong?