I had an interview that asked me to rate various skills on a 1-5 scale. I think I gave myself a 1 in t-SQL and a 2 in C# even though I had been programming professionally in C# since the .NET beta SDK. I was worried they would pull out some crazy trivia questions and and try to trip me up if I rated myself too high. After I rated myself so low they almost didn't want to continue the interview.

I think most places are not like google where if you say 4 it means you invented the language.