I had a somewhat negative experience during an interview last month, but I partly blame myself.
I had worked on a website redesign and showed some wireframes during the interview. Well, the site had then been redesigned after my redesign and this all occured in the span of less than 6 months according to my guesstimate.
I was asked why the site had been redesigned after my redesign and all I could muster was "I am not sure".
I partly blame myself because I was unaware of the succeeding redesign.