There was one development candidate I was interviewing who was speaking to himself in hushed tones, during the interview '...google...sql join...', 'YES, YES, JUST A MINUTE SIR', '...next page...no, no..ah..' etc. Quite ridiculous.
I have to interview about 20 shortlisted people to find 1 decent developer. Problem is it's difficult to use CVs/resumes to shortlist, since many are complete fabrications.