The best interview I ever had, I was given a problem to solve with a system, a whiteboard and 20 minutes.

I sketched out a quick ERD, and explained the high level architecture of the system. No code was written -- it was assumed that I could implement said system if I could design it.

The worst job interview grilled me on low level algorithms (I'm not a CS grad) and wanted me to sketch out a quick sort. Of course, I can describe a quick sort now as a result of said interview, but since it was all C# I doubt we were going to have to implement our own sort algorithms.

Another terrible interviewer asked me about projects I did in college. I finished grad school 3 years ago, and have 8 years professional experience...