in the interview for my current job I was totally honest with them and on my resume and they gave me 3 hours worth of tests - I did well on the stuff I knew, and I failed all the stuff I had never seen before.
thought for sure I'd lost the interview and might as well have gone home when they asked me a question about something on my resume and I was so tired from the long interview and all the tests that I spaced and couldn't get it, and it was a *really* basic question.
I just calmly apologized and said that I was tired and honestly knew that, but wasn't going to be able to get that at the time.
I figured the guy would ask me to leave right then, but he got this big smile on his face and told me I interviewed well and he extended an offer right there.
very strange.