[lportion]

I've had similar experiences.

I went for a job a few months ago where I had to write a program on paper to produce report data from raw data collections, it was reasonably complicated. This is the type of thing I breeze through when I'm sat alone at my desk, but for whatever reason I just went into panic mode and couldn't think straight at all. I apologised and told them just that. It was frustrating to say the least.

The interview went ahead and we ended up talking about various architectures, design patterns, programming languages, functional programming and even HN, but I'm sure I never got the gig because of the technical test.

For the interview at my current gig they walked out of the room for 10 minutes while I had to write sorting algorithms and I was able to do it without a problem. So, for me at least, the element of being watched while I wrote the code seemed to be part of the problem.