I got every question right on Joel Spolsky's freshman UPenn CS exam: http://www.joelonsoftware.com/articles/TestYourself.html.

Now why didn't Google want to hire me? Oh yeah, my brain turned to oatmeal the minute I walked into the interview room :-( It's been six months, and I still have horrible flashbacks to that day. Beautiful corporate campus, amazing lunch... brain-dead interviewee. For example, when asked to write a function to remove duplicates from a list, I gave the "obvious [O(n^2)] recursive solution" -- what the heck was I thinking? Ever heard of hashtables, dufus?

Oh well, maybe I'll try again this year.