Handed my resume to a college recruiter. Phone interview with a engineer, asked me how to determine if a linked-list is circular. After giving him the answer, and him telling me it was wrong I realized he didn't know the difference between circular linked list, and cyclic linked list (the racing problem). I was put on hold a few times during the process and heard back 3 weeks later from the recruiter saying "Thanks" but I didn't make the cut.