If you have done some level of interviewing, you have certainly come across some interesting characters.  Monster.com highlights a few:

Wearing a tuxedo to an interview. I told him to dress nice and professional for his interview, but he definitely went overboard and crossed the line of dressing business professional. Needless to say, the hiring manager also thought it was a crazy move and the candidate did not get the job.

I caught a candidate lying in his resume. He had made up so much of his previous experience that he then forgot a company name where he said he had worked. The candidate actually asked me to look at the resume I had so he could see what he wrote.

This is one I have encountered a few times in sales interviews:

I had a candidate incessantly tell me they were “the best in the market” over and over again. This phrase was added to every sentence as a punctuation mark. It made for a very awkward interview. Confidence is good; arrogance is not.

Then there is this old favorite from CareerBuilder:

Candidate answered cell phone and asked the interviewer to leave her own office because it was a “private” conversation.

Amazing how unaware some people are in today’s world.