I think that's pretty common. At least, I hope it is. I have been that person, and completely flamed out. Probably came across like I knew exactly nothing. I do well under routine job stress, tight deadlines, etc, and I have a great track record producing real results, but something about the interview process puts me on edge and stresses me in unique ways.

Fortunately I don't find myself in that style of interview anymore. The guy interviewing me already knows I can code, so all we are really trying to see if there is a culture fit. My preferred interview location is over beer.