My first interview ever for an internship. The interviewer asked me to rate myself in this language from 1 to 10 as if I'm applying for a lead engineer position at Google. I replied with a number that I thought was appropriate at the time (but now I know it wasn't accurate). The interviewer didn't say anything and moved to the next question. Later, I found out he ranted about my answer on his Twitter, again as if it's expected from an applicant intern at a low tier company to know. Still leaves a bitter taste in my mouth 7 years later.