[DoofusOfDeath]

That happened to me once, during a phone interview with Google.

My brain simply froze during the live coding test. I looked like an idiot, even though the coding challenge was one I could have normally handled in my sleep.

My guess is that it was due to anxiety about doing well on the interview. But to this day I'm gun-shy regarding live coding tests.

[meggar]

I did that at a Google interview too, on a variation of a question I'd practiced a few days before no less.